Chapter 1

At twenty-nine, Lisa Hart ran Biocosmetic Research at Helix Labs. 

Project Eros was Lisa’s pet project. It was designed to activate dormant genetic pathways linked to appearance and tissue repair. Early tests suggested it could improve elasticity and help damaged tissue heal faster. Lisa believed it could do even more.

Most of her peers called it vanity science. Even her own team openly questioned why she bothered spending time on it. 

Lisa had already tested Project Eros extensively on synthetic skin and bioengineered tissue. Most of the results were impressive. But there were a few instances where the data didn't make sense. Some of the tests suggested unexpected levels of cellular growth. 

In the end, promising results in the lab were not enough. Helix needed something they could put in front of investors and sell now. 

Earlier that afternoon, Lisa received a short email from finance. 

Sitting alone in her office after everyone else had gone home, she read the message for the third time. It was short. Budgets were being slashed, and everything was being reviewed. Her department was hit harder than most. Project Eros was dead.

Lisa sat there for a while, her mind racing. Then she made a decision. She closed her laptop and rushed to the lab.

Lab equipment hummed, and air systems cycled overhead. A row of monitors cast a low blue light across the room. The prototype sat in a locked refrigeration unit. 

Lisa crossed the room, engaged the lock with her thumbprint, opened the door, and reached for one of the vials. Under the low lab lights, the serum had a pale pinkish hue with splashes of gold. 

She had already ditched her lab coat and kicked off her heels. Standing barefoot on the tile, wearing tight black leggings and a navy camisole, Lisa no longer looked like the head of a department. She looked desperate.  

Holding the vial up to the light, Lisa exhaled. What she was considering was unheard of. She knew that Project Eros was special and this was her one chance to prove it.

She rolled the vial between her fingers. With steady hands, she drew the serum into a syringe and set it in a sterile tray.

Lisa took a deep breath and hooked her thumbs into the waistband of her leggings, dragging them down just far enough to expose the top of her thigh. 

She swabbed the skin and waited for the alcohol to cool. 

The needle pierced her pale skin, and her thumb pushed the plunger. Slowly, the barrel emptied. She pulled the needle free and tugged her leggings back into place.

Lisa rested one hand on the counter and waited. Suddenly, the room blurred. It came and went so quickly she almost dismissed it. 

What followed was nothing more than a faint warmth radiating across her entire body. 

Suddenly, she was overcome by a burning sensation in her pelvis.

Lowering her gaze, Lisa gasped. The front of her leggings shifted. At first, she thought it was a muscle spasm. 

Then, something else, something completely unexpected.

She stared as a large bulge formed beneath the fabric.  When the movement ceased, Lisa reached for her waistband and pulled both her leggings and underwear down. 

Lisa couldn’t believe what she saw. 

She had a cock. 

Lisa stared, trying to make sense of what she was seeing. It was significantly larger than any man she had been with. Veins ran along the length, and it curved slightly upward. Beneath it, the rest of her body was still familiar and intact.

As strange as the thought was, the cock seemed like it belonged there. 

She ran her fingertips lightly along the shaft, and it responded to her touch. She moaned and tightened her grip. Instinctively, she started stroking herself. Then she caught herself and immediately let go.

She stood there, in absolute awe. The cock, her cock, was real. It was part of her body.

She was still a woman. No, she was more. She was both.

She lifted her head and caught her reflection in the dark glass of the nearby equipment casing. She immediately noticed other changes. Her skin was clearer. Her arms were more defined. When she looked down, her stomach appeared to be firmer. 

She still looked like herself. Just different.

The serum had worked. She just hadn’t expected this. 

Chapter 2

With one hand flat against the counter and the other hanging at her side, Lisa watched as her cock twitched in the cool air. 

Shifting her weight against the counter, she traced her fingers across her stomach. Even that felt different. Everything seemed more sensitive than it had only minutes earlier. Her hand moved lower, and she wrapped it around herself. Then she started stroking again. 

The sensation was unlike anything Lisa had experienced. Her back arched, and a high-pitched sound slipped out of her throat. Her hand continued moving, slow and cautious at first. As her pace sped up, her breathing became increasingly unsteady. Bracing herself against the counter, she bent slightly at the waist. With one hand wrapped tightly around her cock, she reached between her legs and spread her pussy lips apart.

Her cock throbbed in her hand, responding to each stroke. When her fingertips entered her pussy, she gasped. 

It was too much. Lisa’s knees gave way, and she slid down to the floor. Sitting back, she could feel the cool metal of the cabinet through her thin camisole. 

Stretching out and spreading her legs, Lisa glanced down. She wrapped one hand around her shaft, more confident now. At the same time, she pushed two fingers inside herself.

The next few minutes were a blur of pleasure unlike anything she’d ever experienced.

Suddenly, her hips bucked forward as pressure built. It started deep in her core, spreading up through her chest and down her thighs.

Lisa came before she had time to process what was happening.

Her whole body locked up and she clenched her eyes shut. Her pussy tightened around her fingers while her cock started spurting, spilling across her stomach and thighs. When she thought the wave had passed, another followed immediately behind it, leaving her shaking against the cabinet.

Finally, it passed. 

Lisa opened her eyes and looked down at herself. She saw thick pools of cum. 

“Holy fuck,” she whispered to herself.

She had ejaculated. 

She reached for a sterile towel and cleaned herself up. 

Surprisingly, she was still hard. Tracing her fingers along the length of her cock, she looked around. 

The lab suddenly felt wrong. 

Pushing herself up off the floor, Lisa started gathering her things.

Chapter 3

The drive home passed in a blur.

Lisa fought to keep her attention on the road. Every time she shifted in her seat, her cock twitched. Every bump in the road made her tighten her grip on the steering wheel. 

By the time she pulled into the parking garage beneath her building, all she could think about was the heavy weight between her legs.

She turned off the engine and sat there.

Almost there.

Lisa got out of her car and quickly crossed the garage, hoping she wouldn’t run into anyone she knew. She made it to the elevator and soon found herself standing at the door to her apartment, fumbling with her keys.

Inside, the space was quiet. Lisa slipped off her shoes and dropped the keys into the ceramic bowl by the door.

She paused, one hand resting on the edge of the table. She could feel the thin fabric of her leggings stretched tight over her cock, which had begun swelling again during the walk from the elevator.

Lisa moved through the apartment without turning on any lights.

Lisa stepped into her bedroom and pulled the camisole over her head, letting it fall to the floor. She reached back and unhooked her bra. Finally, she pushed her leggings and underwear down and stepped out of them.

Large windows allowed moonlight to illuminate the space.

Naked, she stood in front of a full-length mirror at the foot of the bed. The body in the mirror was still hers. But even in the dim light of the moon, the changes were obvious. Her skin looked amazing. Her arms, stomach, and thighs had more muscle tone. And her breasts had filled out. They were firmer and easily a full cup size bigger.

Between her legs, her cock stood out from her body, thick and hard. Beneath it, her folds were swollen and parted, already wet.

Turning towards the nightstand, Lisa opened the top drawer. Nested in a pile of silk scarves was a collection of silicone, plastic, glass, and steel. 

Her hand hovered for a moment before settling on a medium-sized plug. She set it on the bed before reaching back in and retrieving a purple vibrator and some lube.

She coated the plug with lube. The first press of the cool metal against her rim made her shiver. She worked the plug in slowly, pausing each time her body resisted. When it was finally seated, the stretch was intense. She braced one hand on the mattress and took a few deep breaths.

Crawling onto the bed, she leaned back against the oversized pillows and caught her reflection. She spread her thighs and gazed upon her glistening pussy lips and the exposed base of the metal plug. The image in the mirror made her even harder than she had been earlier in the evening.

Lisa squeezed more lube into the palm of her hand, wrapped it around her cock, and started jerking off. With her other hand, she picked up the vibrator. Powering it on, she brought it down between her legs and pushed it between her thick lips. 

She quickly settled into a rhythm that intensified both sensations.

Suddenly she felt her body seize without warning, hot cum streaking across her stomach and breasts. At the same time, her pussy clenched around the vibrator, and she cried out, her entire body shaking uncontrollably.

When she stopped trembling, she crumpled back against the pillows, gasping for breath. Setting the vibrator on the bed, she ran her fingers lazily through the pools of cum glistening in the moonlight.

Chapter 4

The click of the apartment door cut through the quiet.

Lisa jerked upright.

Footsteps moved down the hall.

“Lisa?” Casey’s voice carried across the apartment. “You here?”

Lisa was so focused on her new anatomy that she had completely forgotten about her roommate. 

Frantically swinging her legs off the bed, she shoved the vibrator and the lube back into the nightstand before grabbing her robe from a nearby chair. She hastily tightened the tie around her waist. 

“I’m back here,” she responded.

Casey appeared in the doorway a few seconds later, gym bag over her shoulder, hoodie slipping off one shoulder. She set the bag down and crossed the room. Reaching out, she switched on the desk lamp.

“Hey, I missed you at kickboxing. And you haven’t been responding to my texts,” Casey said, studying her. “You okay? You look like you’ve run a marathon.”

Lisa smiled, shaking her head. “Long day.”

Casey stepped around the bed. “It smells different in here.” She inhaled slowly through her nose. “I recognize that scent.”

Lisa rubbed a hand over her face.

“Is that your strawberry-flavored lube?” Casey asked.

Lisa exhaled. “Of course you remember me buying strawberry lube.”

Casey came a little closer. “Lisa. You skipped the gym. You look like you’ve been struck by lightning. What’s going on?”

Lisa sat on the edge of the bed, reached between her legs, and pulled the plug free in one smooth motion. 

Casey’s eyebrows rose as she connected the dots. “Oh, shit. Didn’t expect that.”

Lisa set the toy aside. The sensation of removing it was more intense than she had expected. Her cock responded almost immediately and stirred under the robe.

Casey noticed the movement.

“Um, Lisa? What’s going on?”

Lisa followed her gaze. There was no point hiding it now. She stood and opened the robe.

Casey’s jaw dropped. Stepping closer, she extended her hand, letting it hover just short of contact.

“That isn’t real, is it?”

Lisa nodded. “It’s real.”

“Sorry,” Casey said. “I'm really confused. You didn’t have a cock yesterday. How?”

Lisa sighed. “Project Eros. Funding was cut. You know how important it was to me.”

Casey nodded.

“I thought, if I could prove it worked… I decided to test the latest prototype on myself.”

Casey gasped. “You did what?”

Lisa gave a short, tired laugh. “Well. It worked. Both in ways I expected, and…”

Casey took in the physical changes to Lisa before turning her attention back to Lisa’s cock. 

“Can I touch it?”

The question surprised Lisa.

Not waiting for a response, Casey reached out. When her fingers brushed against it, Lisa gasped, and her hips shifted forward.

Casey didn’t stop there. Her thumb moved slowly along the underside. She traced the head with her fingers, wrapped her hand around it, and squeezed.

Lisa’s hips tipped forward, and Casey stepped closer, their bodies touching.

Lisa gave her a small, unguarded smile. “Don’t stop.”

Chapter 5

They stood close enough to feel the heat coming off each other.

Neither spoke. 

Casey let go of Lisa’s cock. Her fingers flexed as she considered what to do next.

“Why am I having flashbacks of that night in college when we got drunk and kissed?” she asked. 

When Lisa gave her a questioning look, she paused, considering her next words carefully. 

“I mean, you know that I’ve fucked guys before. Dozens of them. This is different. I want to know what you feel like.”

Lisa blushed and offered an encouraging smile. “Okay.”

“Good. Tell me if anything feels wrong.”

Lisa nodded. Shrugging her shoulders back, she let the robe fall to the floor.

Casey tightened her grip on Lisa. Her palms were warm. She started slowly, in case either of them had second thoughts.

Lisa moaned.

Casey moved her hand up and down along the length of Lisa’s cock. 

“Good?”

“Yes!”

Then Casey kissed her.

Lisa opened her mouth to her, one hand finding Casey’s hip, pulling her closer. 

Lisa’s voice came out low. “More.”

Casey grinned and sank to her knees.

“Fuck,” she said, looking up at Lisa. “You're beautiful.”

“Casey…”

Casey quickly corrected herself. “You have always been beautiful, Lisa. But you just look different now. And this! I can’t believe this is real.”

She leaned in and let her lips brush the tip. Then she took Lisa in her mouth. 

Feeling her knees go weak, Lisa groaned and took a handful of Casey’s hair. 

Casey bobbed her head up and down, occasionally gagging. Each time, she eased back and then repeated the motion, taking more and more of Lisa.

“Fuck, that feels amazing,” Lisa mumbled, already breathless. 

Casey’s mouth and hands kept moving. One hand made its way up Lisa’s toned stomach before reaching for a nipple and pinching. The other found its way between her legs. Feeling Casey’s fingers tracing her labia, Lisa widened her stance and grabbed the edge of the bed.

Sensing Lisa’s reaction, Casey popped off her cock. “Too much?”

“No, no. Just different… Don’t stop.”

Casey smiled and kept going.

Her fingers moved carefully at first, then with more certainty. 

By the time Lisa realized how close she was, there was no pulling back.

“Fuck. Casey. I’m going to cum!” 

Without removing her mouth from Lisa’s cock, Casey looked up and eagerly nodded. 

When Lisa came, it happened in waves, one burst after another. She grabbed Casey’s head as Casey eagerly swallowed. At the same time, Lisa’s pussy gripped Casey’s fingers, clear fluid flowing around her hand. 

Casey stayed where she was and held Lisa through her orgasms. Both of them.

When Lisa finally sagged back against the mattress, Casey eased away.

Breathing heavily through parted lips, she wiped some stray cum from her cheek.

Lisa didn’t answer. She brushed a damp strand of hair off her cheek with the back of her wrist and let out a single shaky breath.

Casey sat back on her heels. “Holy fuck.”

Reaching out again, her hand drifted back towards Lisa’s cock. When her fingers brushed against it, it sprang back to life. Within seconds, Lisa was hard again.

Wrapping her hand around it, Casey let out a disbelieving laugh. “Seriously?”

“Unexpected side effect, I guess.”

“But you just came. Like a lot!”

Lisa nodded. “Yeah, I noticed.”

Casey let go of Lisa’s cock and stood, pulling her hoodie over her head. She wasn’t wearing a bra. “Round two?” she suggested as she stepped out of her jeans and underwear, never taking her eyes off Lisa.

She quickly climbed back onto the bed and settled over Lisa’s lap.

Resting her hands on Lisa’s shoulders, she whispered, “I want to feel you inside me.”

Without waiting for a response, Casey shifted her weight and lowered herself just enough for the head of Lisa’s cock to catch between her folds. Then she let herself sink slowly, taking Lisa inch by inch.

Casey grimaced as her body adjusted to Lisa’s girth. When she finally bottomed out, she stopped and closed her eyes, taking a moment to steady her breathing. Then Casey started fucking Lisa. 

Taking advantage of Lisa’s length, she started twerking frantically.

“My God! I’ve only seen this in porn,” Casey laughed.

Lisa matched her rhythm, her hands moving over Casey’s thighs before wrapping around her waist. The bed squeaked under them as Casey bounced on Lisa’s cock.

Casey fucked Lisa harder and harder, one hand braced on the mattress, the other gripping Lisa’s shoulder.

The sensation was intense. Lisa didn’t think she would last much longer. The fact that Casey had started to lose whatever rhythm she had been trying to keep suggested that she was close, too.

When Casey came, she cried out Lisa’s name and dropped forward against her. Her whole body clenched around Lisa’s cock. Lisa continued to fuck Casey through her orgasm.

When Casey stopped trembling, Lisa pulled out and wrapped her hand around her cock. It only took two pulls. Her whole body tensed up as she painted Casey’s stomach and breasts. Casey looked down, startled at the sheer volume.

“Jesus, Lisa.”

She dragged two fingers through the mess and rubbed it slowly over her flushed skin before looking back up and letting herself collapse onto Lisa. 

They stayed tangled together, both of them breathing hard, Casey’s head resting against Lisa’s shoulder.

“Fuck, that was hot!” Casey finally said. 

Chapter 6

Lisa woke to sunlight coming through thin blinds. She lay still for a while, one arm across her stomach, taking stock of what had happened. Beside her, Casey stirred under the sheet and opened her eyes.

“Hey, you.”

Lisa turned her head. “Hey.”

For a long moment, neither said anything. 

“I didn’t imagine it.” It wasn’t a question.

Lisa shook her head. “No.”

Casey rolled onto her side and propped herself up on one elbow. 

“What’s it like?” she asked. “Having a cock? Fucking someone?”

Lisa let the question sit for a second. 

“I don’t know how to explain it,” she said. “It just feels right.”

Casey reached out tentatively and started to pull the sheet away. Then she stopped. “I want to know what that feels like.”

When Lisa didn’t respond, she continued. “Not just being with you. I want to be like you. I want to know what it feels like to have a cock.”

Lisa pushed herself upright, the sheet slipping away. Looking down, she casually fondled herself and said, “Casey. This isn’t reversible.”

“I realize that.”

“I know you like guys. Not sure how most guys feel about chicks with dicks.”

“I'll figure it out. Lisa, don’t worry about it. I want this.”

Lisa didn’t say anything for a few minutes. Eventually, she took Casey by the hand and looked deep into her eyes. “If we do this… If you do this… It may be different. What happens will be driven by your DNA. I can only assume your experience will be similar to mine.”

Casey nodded. “I understand all of that. And that doesn’t change anything.”

The room went quiet again.

After a few minutes, Lisa took a deep breath. “I have two more vials at the lab.”

Casey’s face lit up. “You sure?”

Lisa looked at Casey’s hand in hers. Yesterday, she had gambled with her own body. This would be different.

She thought about it. And then, looking into Casey’s eyes, she said one word. 

“Yes.”

Chapter 7

By the time Lisa got back from the lab, it was late afternoon. 

She carried a metallic temperature-controlled case. Setting it on the kitchen table, she waited for Casey before opening it.

Casey entered the kitchen, her bare feet shuffling across the cool hardwood. She was wearing lounge shorts and a thin tank top that clung lightly to her skin. She didn’t look nervous. 

Lisa studied her. “I have to ask one more time. You’re sure?”

Casey nodded. “Absolutely.”

Lisa opened the case and took out one of the two remaining vials. Then she reached for a sterile syringe and drew the pinkish-gold serum into it. Nodding toward the hall, she said, “Let’s do it in my bedroom.”

Casey was already lying on the bed by the time Lisa caught up.

“Upper thigh,” Lisa said.

Casey tugged her satin shorts high on one thigh. Shifting her hips, she pulled the fabric a little higher.

“That’s good.”

Lisa swabbed the area and positioned the syringe. The needle went in smoothly. 

Casey inhaled through her nose, then let her breath out in a slow exhale.

“So warm,” she said. 

Lisa stayed close, one hand resting on Casey’s knee. “Are you doing okay?”

“So far, so good, I think.”

“If anything feels wrong, tell me,” Lisa instructed.

Casey’s back suddenly arched and one hand grasped the sheet. 

Lisa noticed that Casey’s stomach muscles and thighs were visibly twitching. Dropping onto one knee beside the bed, she took Casey’s other hand.

Casey’s nipples visibly hardened under the thin tank. Her chest rose and fell sharply as her hips shifted against the duvet.

Suddenly, a thick, phallic shape started to emerge under Casey’s shorts.

“Oh, fuck!” Casey gasped. “It’s happening. I can feel it!”

The bulge continued to grow. Lifting her head, she glanced down before sliding her fingers inside her waistband. She hesitated briefly, then shoved the shorts down.

Her cock sprang free. 

Beneath it, the rest of her was still there.

She stared at herself, her mind racing. She then awkwardly pulled her tank top over her head, tossing it aside.

Then she laughed once, still trying to catch her breath. “Fuck. Look at me!”

She ran her hands across her body. Her hands settled on her breasts. “It worked. And holy shit, look at my boobs!”

“It certainly did,” confirmed Lisa. Like her, Casey had a radiant glow. Her entire body had changed. She was noticeably more toned. And yes, her breasts were significantly bigger. 

“Casey, you look amazing!”

Casey wasn’t listening. She was laser-focused on one thing. Reaching down, she wrapped her fingers around her cock and tightened her grip. There was no lingering, no teasing. She started aggressively stroking herself. A sensation that was both familiar and new hit her hard. Her mouth fell open as her head tipped back into the pillows, but no words came out. 

She came almost immediately.

Her cock pulsed hard in her hand as she spilled across her torso. She stared in awe, half laughing, half stunned by the amount of cum and the velocity with which it erupted from her body.

“Oh, my God!”

Lisa watched with an approving grin before standing and quietly removing her clothes. She took her own erect cock in one hand and started pleasuring herself. Her orgasm came quickly, her hot seed spilling over Casey’s stomach and breasts, mixing with Casey’s cum.

Casey blinked in disbelief. Then she laughed.

“Fucking pervert.”

Lisa leaned in, scooped up some of their shared mess, and brought it to her mouth. “Mmm…” She repeated the motion and fed some to Casey, who eagerly accepted the offering.

Leaning back in, Lisa whispered, “Shush,” before pulling her into a deep kiss.

Casey kissed her back. And then, with a newfound strength, she easily flipped Lisa onto her back and climbed on top of her.

She glanced down and realized that her cock was hard again.

“I have a cock! And it is fucking perfect!” Casey exclaimed, looking down at her. “And now I'm going to use it.”

Lisa tried to contain her excitement. Reaching down, she lined Casey up in front of her gaping pussy. 

“Do it. Fuck me, Casey!”

Chapter 8

Riley let herself into the apartment with the spare key Lisa had given her months ago.

“Lisa?” she called, slipping off her shoes by the door.

No answer.

At first glance, the apartment appeared to be empty. The kitchen light was on, but nobody was present. Looking down the hallway, Riley noticed light coming from one of the bedrooms.

Stepping inside, she set her bag on a chair near the entryway and listened. 

That was when she heard it. Not words. Moans. 

She held still and listened. If Riley didn’t know better, she would have thought that she was listening to the steady rhythm of two people having sex.

She paused before moving down the hallway on quiet feet, propelled by curiosity.

As she approached the half-open door, she gasped. Lisa was on her back, hands twisted in the sheets. Lisa’s roommate, Casey, was leaning over her, plunging in and out at an unrelenting pace. At first, Riley thought they were using a strap-on.

Upon closer inspection, she realized that there was no harness. Casey had a cock.

Riley stayed where she was, unable to look away. 

She rubbed her eyes. Casey definitely had a cock. And it was a very impressive cock, at least compared to the handful of guys that Riley had been with. Casey was using it to fuck Riley’s best friend.

Riley was about to turn away when she realized something else. Lisa had a cock, too. It was even bigger than Casey’s and was flopping against her stomach in sync with each of Casey’s thrusts.

A sound slipped out of Riley before she could stop it. Covering her mouth, she leaned back against the wall just outside the doorway and out of sight.

She kept watching the scene inside the bedroom.

“Fuck, Casey. Don’t stop!” Lisa screamed.

Casey didn’t.

Riley knew she should turn around and leave. But she was overcome by the sudden realization that she was incredibly turned on by what she was watching. Her hand slid under her skirt and between her legs. She stayed against the wall, touching herself while she watched her friends fuck.

With one hand on Lisa’s hip and the other planted beside her shoulder, Casey kept thrusting in and out of Lisa. 

Lisa reached out and held on to Casey with both hands as her body started convulsing. 

Riley knew an orgasm when she saw it. What caught her by surprise was the sight of Lisa’s cock spilling thick streaks of cum straight into the air, coating both her and Casey.

Casey kept moving through it until Lisa’s hands loosened and her body went slack. 

“My turn. Where?”

Lisa’s voice was rough and wrecked. “Come inside me. Fill me up, Casey.”

Casey’s entire body started trembling. She buried herself in Lisa and choked out a hoarse, “Holy shit!”

Lisa closed her eyes and held on to Casey, savoring the sensation of being flooded by her roommate.

When Casey was done, she pulled out, a trail of cum following her. More spunk spilled from Lisa after Casey finally slipped free. 

Casey looked at herself and grinned. Reaching down, she ran her fingers along her still hard cock. 

“I have no idea how I’ve lived this long without one of these,” she laughed. “I mean, I’ve had some crazy, insane orgasms, but that was something else. No wonder this is all most guys can think about!”

Chapter 9

Riley was shocked by what she was seeing, but that didn’t stop her from continuing to pleasure herself. Another sound escaped her lips, this time a whimper.

That was when Lisa shifted and looked up.

Casey followed Lisa’s line of sight a second later.

Both of them noticed Riley at the same time.

Riley met their eyes from the hallway, one hand braced against the wall. With a deep sigh, she lowered her other hand to her side.

“Fucking seriously, guys,” she said after a second. “I was so close!”

Neither of them said anything.

Riley offered an innocent smile. “I let myself in. Spare key. In hindsight, maybe I should’ve knocked.”

Only then did Lisa speak. Still half out of breath, she asked, “Were you seriously masturbating in my hallway? Watching us fuck?”

Riley shifted her gaze towards the floor and blushed.

That got a sound out of Casey. Not quite a laugh. But close.

Lisa dragged a hand across her face. “Actually, don’t answer.”

"Too late,” Riley said with a smile, adjusting her skirt.

A few seconds passed before Riley pushed off the wall and stepped into the room. “I didn’t mean to interrupt,” she said. “I should probably leave.”

Lisa sat up a little and shook her head.

Riley shrugged. Stepping further into the bedroom, she said, “I came over to return your phone charger, not to walk into… whatever this is.”

Lisa glanced at Casey, then back at Riley. “That’s fair. I'm not happy, but I get it.”

Riley sat on the edge of the bed. “Well,” she said with an awkward laugh, “what exactly do we have going on here?”

Lisa raised an eyebrow. “The short version or the long version?”

When Riley didn’t respond, Lisa started from the beginning.

She didn’t dramatize it. She didn’t soften it either. She told Riley about the serum, the funding being pulled, the decision to inject herself, the subsequent transformation, and what had happened after Casey walked in on her. 

Casey filled in the rest, beginning with the moment she told Lisa she wanted to be like her.

Riley listened without interrupting.

When they were both done, she turned to Lisa.

“So, for you, this started as an accident.”

“Yes.”

Then Riley looked to Casey.

“But you asked for it. You wanted it.”

“I did.”

Riley let that sit.

Lisa slid off the bed and stood, not bothering to cover herself. 

“You’re different,” Riley noticed.

Lisa nodded.

“And not just, um, that,” she said, gesturing at Lisa’s still hard cock. “You’re glowing. Your hair looks amazing. And is it just me, or are your tits bigger?”

Casey scooted up and leaned against the headboard, grinning and cupping her own breasts, marveling at their fullness.

Lisa’s mouth twitched. “Yes. All of that. And that’s just the physical side of it. I feel more alive than ever. I don’t know how else to explain it.”

Lisa reached for a robe and pulled it on. Walking over to the closet, she retrieved a similar robe and handed it to Casey before joining her.

Riley remained where she was and kept asking questions that showed Lisa she was genuinely trying to understand.

After all her questions were answered, she looked down at the outline of Casey’s cock under the sheet. “One last thought. You said there is one more vial?”

Without a word, Lisa pushed herself away from the bed and left the bedroom. A moment later, she returned with the case. She set it on the desk and opened it. Inside, illuminated by the soft light from the bedroom lamp, was the last vial.

Riley stared at it.

Suddenly, Casey chimed in. “Riley… Do you want it? You can have all of this too!”

Riley’s eyes shifted from the vial to Casey and then to Lisa. “Serious?”

Lisa interjected with a gentle smile. “If you're interested, yes. Riley, you are my best friend. I can’t think of anyone else who would be more worthy.”

Riley was quiet.

When she finally spoke, her voice was calm.

“Most of my life, people have acted like I should want more. More confidence. More ambition. More of whatever they thought I was missing.” She squeezed her hands, took a deep breath, and then looked directly into Lisa’s eyes. “It took me a while to figure out that not wanting those things didn’t mean I was settling.”

Lisa said nothing.

Riley turned towards Casey. “Don’t take this the wrong way, but I can see exactly why you wanted this.”

Casey met her gaze.

Then Riley turned back to Lisa. “But here’s the thing… I like my body. I like the way I move through the world in it.” She paused. “I don’t need that to be happy.”

Both Lisa and Casey nodded, respecting Riley’s decision.

“Thank you,” said Riley, “for offering.”

Lisa leaned back against the headboard and gave Riley a playful look. “You don’t want the serum. I respect that.”

Before Riley could respond, Casey blurted out, “That doesn’t mean the three of us can’t fuck, right?”

Riley stared at her for half a beat. “You are unbelievable.”

Lisa pulled her robe tighter and started walking towards the doorway. Casey was right behind her. At the threshold, Lisa looked back over her shoulder, one corner of her mouth turning up.

“Well, you were complaining that you didn’t finish.” Fondling her swelling cock with one hand and Casey’s with the other, she smiled. “Riley, my dear, we have the technology.”

That made Riley laugh, even harder than before.

Chapter 10

The three of them moved into the kitchen. Sitting around the table, they opened a bottle of wine and kept talking. 

When she was getting ready to leave, Riley paused by the front door. Lisa and Casey stood close together, fingers linked.

Turning, Riley inhaled deeply. “Um, maybe this is the wine talking. Change of plans.”

“Excuse me?” Lisa and Casey said at the same time.

Crossing the room, she stepped between Lisa and Casey. “Is your offer still on the table?”

“Offer?” asked Casey.

Riley stepped forward and cupped her hand softly over Casey’s chin. She cupped Lisa’s cheek with her other hand. 

“As you pointed out, I did not finish earlier. I was too embarrassed to admit it at the time. But truth? I’m so fucking horny right now that it’s not even funny!”

When neither of them commented, she continued. “Here’s the thing… I’ve never experienced two cocks at the same time. I’ve always fantasized about it. But the logistics…” 

Reaching out, she untied one robe and then the other. Taking Lisa in one hand and Casey in the other, she continued, “Casey, I chose to not take the serum. I chose to not be like you. That doesn’t mean that I can’t choose to take you up on your offer."

“Say the words”, Casey challenged.

Lisa nodded, an eager sparkle in her eyes.

"I want to be spit-roasted by the two of you!” Riley let that hang for a moment. “What do you think?”

The next thing Riley knew, both robes were discarded, and four hands were fumbling with her clothes.

“If I didn’t know any better, I would think I was about to fuck two 18-year-old virgins,” she chuckled, helping them unbutton her shirt before unzipping her skirt.

Dropping to her knees, she wrapped one hand around Casey and the other around Lisa. Stroking the two of them, she looked up. “You’re both sure about this?”

“Shut up and suck my cock,” choked Casey, her voice cracking in anticipation. 

“You heard her,” confirmed Lisa, a predatory grin forming on her face.

Riley took Casey into her mouth. She bobbed her head up and down for a few minutes before turning to Lisa. While repeating the process on Lisa, she stroked Casey’s cock. 

She drove the women crazy, alternating between teasing them with her tongue, jerking them off, and taking each of them down her throat.

Lisa watched in awe. “Riley. How have I not known about this side of you?”

Gasping for breath, Riley pulled off Casey’s cock. “Later… Right now, one of you needs to fuck me!”

Lisa reached down and pulled her to her feet. Grabbing her by the waist, she bent Riley over and playfully slapped her ass with her cock.

“Do it! Treat me like a fucking whore and fill me up, Lisa!” 

Lining up, she eagerly slammed into Riley. 

“Yes, yes, yes!” cried Riley. “So fucking big! So good!” 

Seeing Casey standing off to the side, watching and stroking herself, Riley reached out. “Don’t just stand there and watch, Casey. Get over here and fuck my pretty little face.”

Casey stepped closer and shoved her cock in Riley’s open mouth. Wrapping her hand around the back of Riley’s head, she proceeded to ravage her mouth. 

Suddenly, Riley surprised her by reaching up and slipping two fingers inside her pussy. 

Casey froze. “Holy fuck!” 

Each of Lisa’s brutal thrusts drove Riley’s hand deeper inside Casey, making her squirm.

“No genitalia left behind,” chuckled Riley between gasps, with a wicked grin. “Now keep feeding me that fucking cock!”

Casey complied. 

After a few minutes, Riley started gushing on Lisa’s cock. 

“Yes! Cum on my cock, Riley!”

Lisa kept fucking her and Riley moaned around Casey’s shaft.

Casey screamed, “Oh, oh, oh! Too much. I’m close!”

“Me too!” Lisa echoed, with a whimper.

Dropping to her knees, Riley looked longingly at both cocks. “On my face!” 

Standing side-by-side, Lisa and Casey exchanged smiles while they stroked their cocks.

Lisa came first, shot after shot splashing across Riley’s face.

“Yes! More!” shouted Riley. 

Casey followed Lisa's lead and exploded, covering Riley with a fresh coat of cum.

Slumping back against the couch, Riley wiped her face with her fingers and sucked them clean. “Wow! Just… wow.”

Lisa watched. “I had no idea you were such a freak, Riley!”

“I prefer the term cum slut,” Riley offered, with a guilty shrug. “I mean, just because we’re best friends doesn’t mean I tell you everything, Lisa.”

Chapter 11

After cleaning up, they decided to call it a night. 

As she was leaving, Riley paused to hug both Lisa and Casey.

“Just so you know,” Riley said, “I don’t think this makes either of you any more or any less than you were.”

Lisa smiled. “I love you, Riley.”

With a shy smile, Riley mumbled, “Yeah, I love you too.”

With her hand on the doorknob, she turned back toward Lisa and Casey. “And, um, if you two ever want to fuck again…”

“Any time!” Casey exclaimed, throwing her arms around Riley.

Lisa nodded in agreement as she approached, joining them in a group hug.

Eventually, Riley pulled back and let herself out, the door closing softly behind her.

Lisa stood by the door with one hand still on the knob, listening to Riley’s footsteps fade down the hall. 

Casey retreated to the kitchen and returned with two glasses of water.

“Thank you,” said Lisa with an appreciative smile as she turned to look out the window. Below them, the city kept moving. Cars passed through the intersection. A siren sounded somewhere off in the distance.

Lisa felt Casey beside her.

“You okay?” Casey asked.

Lisa took a sip of water before answering. “Yeah.”

Casey pulled her closer. “You know, I thought I’d feel different,” she said, her breath hot against Lisa’s neck.

Lisa glanced at her. “You do.”

Casey snorted softly and reached around to give Lisa’s cock a playful squeeze.

“Don’t tempt me. I would happily fuck you again, right here against the window.”

Casey grinned, but didn’t take the bait. “I feel like a better version of myself. Thank you.”

Lisa turned the glass slowly in her hand.

Casey rested her chin on Lisa’s shoulder. “You?”

Lisa continued to look out the window. “Same.”

“What are you going to do with the last vial?”

“No idea.”

“Does it bother you?” Casey asked. “Having one left?”

Lisa stepped away and sat down on the couch, resting her forearms on her knees. She thought about it for a few minutes before answering.

“No.”

Casey waited.

Lisa glanced in the direction of the bedroom, then back at Casey. “Yesterday, it would have.”

“And now?”

Lisa leaned back. “I don’t know. Now it just doesn’t.”

Casey accepted that. She sank into the couch and stretched out, shifting until her legs were tucked partly beneath Lisa’s.

They sat there and talked for what felt like hours. 

Eventually, they got ready for bed. Their routine was surprisingly ordinary. Casey brushed her teeth. Lisa washed her face and tied her hair back.

“My room?” Lisa asked.

Casey nodded.

They crawled into bed in silence. Casey settled close, one hand resting lightly on Lisa’s waist beneath the sheet. Within minutes, Casey’s breathing slowed.

Lisa remained awake. In the darkness, she studied Casey’s face. She looked peaceful.

Lisa reached beneath the sheet and covered Casey’s hand with her own.

Casey stirred but did not wake. Her fingers tightened around Lisa’s.

Lisa smiled in the darkness.

Then she closed her eyes and drifted off to sleep.