The lights were off, and the air was stuffy in our little apartment. Neither of us had said a word since we'd gotten home from school. We hadn't even seen each other. Stephanie wasn't mad at me, but she certainly wasn't in a good mood after she'd been volunteered to help out with Freshman Night. I should have been the mad one.

“Me? Why me?” Stephanie complained to Ms. Bandi. “Why not Alex?”

“Oh, good idea, bring him too,” her teacher told her.

The job wasn't hard. All we had to do was look approachable in the assembly hall and rescue the terrified, wide-eyed freshmen. We would set up tables and prepare to answer the endless stream of questions from both the newcomers and their equally panicked parents. I remember it as a complete waste of time when I was a freshman, and I had no plans to interfere with that tradition. So naturally, the majority of my afternoon was spent on the couch, nodding off like it was a dress rehearsal for my complete uselessness in a few hours. But the time finally came.

I'd only been wearing my soccer shorts while I lounged on the couch all afternoon. It was just too hot. As I got up, though, I noticed something at the far end of the sofa, something soft and blue that my toes brushed up against. Stephanie's blue panties.

Lately I'd been noticing her underwear selections a lot more. I kind of wondered whether she was doing her yoga more, or maybe wearing shorter skirts on purpose so I'd notice. I'd noticed these, though. They were the ones from last night when she got home from work early—early being midnight. Stephanie burst through the door in a thin blue dress, no bra, and the hemline just barely covered her underwear. The second she sat down next to me on the couch and started scrolling through her phone, though, I saw them.

“Get a grip,” I told myself, shaking my head. “She's your sister.”

I tossed them back down onto the cushion and plodded up the stairs, rubbing my eyes. When I peered down, a small bulge rubbed at the fabric of my shorts and swayed side to side as I walked. A faint glow came from the bedroom. The door was ajar.

“Steph? Are you ready? We're already late,” I called from the end of the small hallway, trying to sound anything but flustered.

No reply. Her lack of enthusiasm was to be expected, though. She'd made that perfectly clear by slamming the door with such force we'll need to pull a permit to get it repaired. I padded toward the door; the rickety flooring complained under my feet.

“Hey, don't tell me you forgot already? We need to leave, or Ms. Bandi is going to lose her lunch.”

There was heat coming from the small crack in the door. It felt more humid than the bathroom did after a shower. I slowed as I drew near and was thankful I hadn't put on those loud, fancy dress shoes yet. I tiptoed the last few feet, watching to make sure my erection hadn't gotten any larger.

“Steph?” I whispered.

Some dishes clanged together in the apartment next door as the neighbors unloaded their dishwasher, but that was it.

I set my ear along the opening and listened. She was definitely in there. It sounded like she was working out, like one of her yoga sessions had gone long and she'd lost track of time. I nudged the door inward and found my sister lying on her bed.

She was lying on her tummy wearing a loose white T-shirt. The hem folded into her cheeks. Her feet dangled above her, crossed at the ankles. A frayed cord connected her earbuds to the screen in front of her face that had her so distracted. That's why she hadn't heard me. That's why she probably couldn't even hear herself as she laughed quietly into her phone.

“What's that? I can't hear you. Oh, screw it—I fucking hate these things,” she said, unplugging her earbuds and stowing them neatly across the room, against the wall, where they eventually came to rest on a pile of clothes. “Is this better?”

“Yeah, I think so...” a girl's voice whispered through the speaker.

“So what were you saying? Were you complaining? It sounded like you were complaining.”

“What? No! I, uh, just wanted to make sure you were alone, that's all.”

“Seriously, I'm sitting here naked, and you're complaining!”

The girl paused for a moment. “Well, how do I know you're actually naked? You keep saying that, but I can only see your face.”

“Pfft! I can only see your face!” Stephanie snapped.

“It's not safe! I'm not alone, and you know it!”

“Well, why did you call me? You interrupted my workout, you know...”

“Oh, well, sorry. I didn't mean to. I can call back later if you want—”

“What? Jesus, calm down,” Stephanie barked. “It's OK. I'm kinda glad you called. I haven't seen you in a while. And honestly, I keep thinking about what you did to me.”

“What I did to you!”

“Riley, you fingered me. Or did you forget?”

I sucked in air and tried not to cough.

“You still there?” my sister asked.

“Yeah, I'm just closing the door. I told Christian I was picking out an outfit so he doesn't walk in, you know, and bother us.”

“Ooh, bad girl. Are you going to give me a private show?”

There was some hesitation. The soft sound of breathing came through the other end.

“Riley, it's a little late to be nervous, you know.”

“I'm not nervous—I'm just thinking, alright? And you need to be quiet!”

“Fine! I'll go first. See?”

Riley snorted. “See! You're not naked! I knew it!”

Stephanie held the phone up over her shoulder and grinned. She pinched her shirt and tugged it up past her butt. “You like my thong? Oh, come on, what's with that face? I bet you're getting wet.”

“Stephanie!”

My sister kicked her feet into the mattress. “No, seriously, this isn't fair. Show me yours! I mean, you look good in your little shorts and everything—and your top is super cute—but come on... Work with me here!”

“My brother's home!”

“So is mine!” Stephanie shouted in a whisper. Her head very suddenly swiveled around, focused on the tiny crack in the door, then turned back to her phone. “At least I think he's home, I dunno. Oh come on, what's the big deal? He's only your half-brother, right? Besides, I bet he has a crush on you.”

It sounded like Riley's phone tumbled to the ground. After a brief pause, she took a breath and huffed, “Hmm? That's dumb. Why would you say that?”

“He's a horny teenager, that's why. Oh, and also you're a hot piece of ass. So there's that. Wait, what's wrong?” Stephanie brought the screen closer to her face. She narrowed her eyes. “Ooh... Wait, you have a crush on him, don't you? Oh my God! Riles!”

“I do not!” she insisted. “That's... That's...”

“Whatever... I've seen him. He's cute.”

“He's my brother!”

“Half-brother,” Stephanie corrected. “And so what? I bet he has a nice dick.”

An audible gulp.

Stephanie rocked her hips side to side and settled into the mattress. “So?”

“So what?” Riley asked.

“Is it nice?”

“Oh my God! Steph!”

“Boo...” Stephanie pouted. “You're no fun.”

“I am too,” the girl declared unconvincingly.

“Well, prove it.”

“OK, fine! I will! What do you want me to do?” Riley said, eager to change the subject.

“Take off your shorts then...”

A moment ticked by. Then another.

“Riley...”

“Ugh!” the girl groaned. “Fine! There! Happy?”

Stephanie grinned. “No, not quite, actually. Slow down... No, no, no... Like way slower... Yeah, like that. Actually, wait. Put your phone on your desk or table or whatever that thing is. Then, stand in front of it and turn around.”

“Turn around?”

“Yeah, and get a little closer. Yeah, come back—no! Forward!” she cried. “Right there! Damn, those really are tight... Are you sure you're wearing underwear?”

“Yeah...” Riley's quiet voice replied. “I bought some just like yours.”

“Oh yeah? Come closer and lean forward a little. Just sort of, I dunno, bend over for me. Wait—do it casually, like you're not doing it on purpose. Do it like you're a good girl, but there's a cute boy back there that you're hoping will see it.”

“You are such a creep,” the timid girl croaked.

“And pull your shorts in a bit, right into the middle of your ass. Give yourself a wedgie.”

Riley only sighed.

“Arch your back a bit more. Yeah, just like that. And you know what? You're right, I can see your sexy thong under there. It looks nice. I bet it drives your brother crazy. Is that why you bought it?”

“No! Steph! Oh my God!”

“What? Oh, please... You walk around in front of him dressed like that, right?”

“Yeah...”

“With your ass cheeks hanging out?”

“They're not hanging out... I mean, not completely. Can we change the subject?”

“But you guys share a room, right? What do you wear to bed? Stuff like that?”

“Oh my God, yes! And sometimes I even wear pajamas! Crazy, right?” Riley said sarcastically. “And how long do I have to stay like this? Haven't you seen enough yet?”

“Aw, what's wrong? You don't like bending over for me?”

There wasn't an immediate response, so Stephanie propped herself up on her elbows and got comfortable. She made a vain attempt to pull her shirt down, but it was snagged under her tummy and didn't budge.

“Come on, Riley,” she said. “You know you're making me wet, right?”

Finally, an answer, and with noticeably less hostility. “I am?”

Stephanie exhaled slowly into her screen. She nodded. “You have no idea how good you look, do you? God, I wish I was there right now.”

“Yeah?”

“Yeah.” A short pause. Stephanie's voice dropped. “I'd run my tongue up your pretty thighs.”

Riley gulped.

“All the way up to your ass. I'd lick you between the legs right through your shorts. Fuck, I bet you taste so good.”

There was a cough. A loud swallow.

Stephanie lifted her butt suddenly. She slipped her arm under her, then settled back down. Her hips began to hump the palm of her hand. She whispered, “What are you doing, Riley?”

“I'm... I don't know... I'm taking my pants off?”

“Why are you doing that? You want to show me your pretty little ass?”

“No... I mean, maybe? It's just, I dunno, the way you talk to me... It makes me...”

“Want to touch yourself?” Stephanie finished.

Riley said nothing.

“It's OK. I'm touching myself right now.”

“Oh yeah?”

“Yeah. And you probably can't see it, but my panties are soaked,” Stephanie said softly. She held the phone up over her shoulder. Her tongue tickled the corner of her mouth. “God, I wish you were here.”

“I wish I was there too.”

There was a moment of calm. Just a quiet sigh. Stephanie's thighs opened up a little wider.

“Actually,” Stephanie said, “don't take them all the way off. Leave them just like that, under your butt.”

“Like this?”

“Yeah, exactly—but don't touch your panties. Leave them right where they are.”

“And my shirt?”

Stephanie gulped. “You aren't wearing a bra?”

“Uh-uh,” Riley confirmed.

“Then take it off.”

“And then what?”

“I want you to... to... how about you get on your knees? Hold your phone way up high so I can see your front and your back at the same time.”

“OK,” was all the sweet girl said.

A few seconds passed, then Stephanie's thighs came together and suffocated her hand.

“Is this good?” Riley asked eventually.

“Yeah.”

“You can see my boobs?”

A nod.

“And my butt?”

Stephanie grunted.

“Why do you want me down here? Is it so I can—” she paused “—lick you?”

My sister shuddered. I could see her fingers work her panties to the side and practically drown in her juices.

“Is this what you wanted? Do you like watching me?”

“You seriously look so fucking good,” Stephanie whispered. “You're going to make me fucking cum.”

“I am?”

“Touch yourself. Put your hand in your panties and play with your pussy. I want to see you fucking touch yourself.”

Riley's voice cracked. “Like... like this?” she asked.

“Yeah, but keep the camera right where it was. I want to see your face.”

My forehead pressed the door inward. Nobody noticed. My eyes couldn't be separated from my sister's milky thighs, and her plump butt that Justin so often reminded me was just like my own. He loved her ass. But none of that mattered now as I cursed myself for finally realizing he was right.

Riley spoke up, her meek voice even more uncertain. “Stephanie?”

“Yeah?”

“It was nice.”

“Huh? What was?”

“Christian's dick.”

Stephanie curled a finger over the lips of her pussy and jammed it inside. “Oh my God, Riley, I knew it! I just knew it! When were you going to tell me—never mind! Tell me everything! How did it happen? When did you see it? Everything!”

“This is crazy,” Riley muttered.

“Riley!”

“You want me to tell you how I saw my brother's dick?”

“Yes!”

Riley paused, took a break, then spoke, “We were getting ready for bed. Well, actually, we were already in bed. He was in the top bunk; that's where he sleeps.”

“Was it big?” Stephanie interrupted.

“I don't know. Maybe? Is your brother's dick big?”

Stephanie laughed. She didn't even consider it. She didn't give it any thought whatsoever. She just laughed at the prospect that I could have a big dick. But even worse was that, at the exact moment I was mentioned, her hand stilled, like my dick was a joke.

Eventually she explained, “No, it's not that. Don't you think it's funny that we're both so poor we share a bedroom with our brothers? And now we're talking about their dicks? Riley? Hello? Are you there?”

“I was being serious, Steph. I really don't know if Christian's is big. How big is Alex's? When did you see it? Does he know?”

“No! Of course he doesn't know,” Stephanie said. But then she paused to consider. She scrunched her nose, then continued, “Well, maybe, I dunno. But the point is, his dick isn't, uh, well... It's actually—Alex has a sweet dick. That's the best way to say it.”

“Sweet? What does that mean?” Riley said a little impatiently.

Stephanie raised her eyes to the ceiling while she contemplated. But the pads of her fingers found her clit again and began a slow, circular motion as she attempted to describe her brother's dick—my dick. Then, she blushed. Stephanie, as long as I can remember, has only done that a handful of times. I remember it because she turns bright red.

“His cock is as shy and as beautiful as he is,” she said, her cheeks already pink and with no signs of stopping. “Can you imagine? What if our brothers heard us? What if they knew what we were saying?”

Riley ignored her. “How did you see it? When?”

Stephanie's hand stopped.

My heart sank. She needed to keep going. I desperately had to know if I excited her as much as she was exciting me. And it was all out of nowhere too, at least I thought it was. But no, ever since Justin had mentioned how hot he thought she was, it was all I could think about.

I started to notice how short her shorts were, and whether she was wearing something underneath. I really became interested in her sleepwear—the exact thing she had on right now.

Stephanie cleared her throat. “Um, OK, sure... I guess I'll go first, but we're doing your brother next since you brought it up in the first place.”

“I did not!” Riley protested.

“Whatever,” Stephanie replied. She paused for a moment and exhaled through her nose before adding under her breath, “God, this is so fucking weird—ah, whatever... Look, the thing you have to know about my brother's cock is it's kind of shy and pretty, just like him.”

The curious girl on the other end sighed. “Oh? How is it pretty?” she asked.

“I dunno, it's smooth—I think he shaves. And it's got the cutest pink tip. It's kind of skinny and pale like he is. But it's, I dunno, nice, I guess. I like it,” Stephanie admitted through gritted teeth. She looked like she was about to add more, but instead bit her lip.

Riley picked up on the cue and asked into the uncomfortable silence, “So, uh, how did you see it?”

Stephanie chuckled. “So yeah, I hope you don't think I had some super secret, elaborate scheme to perv out on my brother... Because nope, it just happened naturally, the old-fashioned way, if you will—hey, will you do something for me?”

“Um, sure, what?”

Stephanie turned over onto her back, settling on a mountain of pillows to support herself. She extended her phone hand as far as it could reach to show Riley. Then, she slipped her shirt up over her breasts and spread her legs.

“Alright, your turn,” she said.

Riley sounded relieved. “Oh, thank God, my knees were starting to hurt. And these shorts are really pinching into my thighs,” she complained.

“Yeah, ditch those. Take them off. You can take off your underwear too.”

“Oh, OK.”

My sister's breasts weren't big, not even close. That's probably why people thought we looked alike, why they thought we were twins. She was mistaken for a tomboy, and I was, well—Justin told me if I were wearing a skirt and facing the other way, he wouldn't be able to tell me apart from my sister.

Stephanie brought a finger to her lips and sucked it clean. She said, “And open your legs. Hey, what's wrong?”

“You aren't recording this, are you?”

“What? No. But that's a good idea,” she pondered out loud.

“Steph!”

“No, Jesus... Calm down... And how do I know you're not recording? I'm lying here showing you my pussy and talking about my brother's cock!”

Riley said nothing. She just watched along with me as my sister traced a finger down from her lips, over her breasts, down between her legs. Stephanie's eyes flickered.

“You know it's funny,” she said, “I never even noticed him until he started hanging out with that cute blonde boy.”

“Oh, Justin? Yeah, that's his boyfriend,” Riley confirmed.

“Like, I just can't help but notice Alex in his little soccer shorts—you know he wears those around the apartment all day? He doesn't even wear a shirt. And now I'm convinced he's not wearing underwear either. I can just see it dangling and moving around under his shorts. I bet you he's doing it...