I opened Susan’s bedroom door and noticed something. She and my cousin Terri jumped and slid apart quickly. They’d obviously been talking, so I grinned and softly said, “No fooling around now. It’s time for bed.”

Both girls giggled then. They weren’t, they were just talking in whispers as Terri spent the night with my sister. They were both eighteen that summer and had graduated from high school not long before. As for me, I was home from college and bored as hell.

After that giggle I noticed something. Terri looked sad. She looked really down right then. I frowned slightly and asked her, “Are you ok?”

She nodded, but it didn’t look like it. I closed the door then and pulled the chair from Susan’s desk over to sit in front of them. “Are you sure? What’s the problem?” She didn’t tell me, but Susan did.

“Her boyfriend dumped her, Chris.” I shook my head and looked at my cousin. “I’m sorry, Terri. That sucks. It really does.” I took a breath then asked, “Was it another girl?”

She shook her head sadly. “No. He said I didn’t do something very well, and he was tired of it.” I probably looked slightly confused then, at least until Susan chimed in.

“He told her she was lousy at sucking him. The shit told her she gave lousy head.” I looked at Terri and said, “Really?” she nodded looking miserable. “Hell, that’s just something that takes practice. You can learn how to be better at that.” I glanced at my sister who smiled at me. Terri just shook her head again.

“He didn’t care about that. When he dropped me off at the end of the night, that was it. We were through.”

I realized a couple of things then. I couldn’t help Terri with her problem. And sitting there talking about blowjobs was making me horny again. That probably wasn’t the best mood to be in, but with both girls wearing just an old t-shirt and panties that night, I couldn’t help myself. Susan had dark hair and nice C-cup tits that I was more than familiar with at that point. Terri, on the other hand, was a blonde and slightly bustier. I glanced at her braless tits then, guessing them to be a good full D. I checked them out and knew then that frustration was coming my way that night. So I shook my head and told my cousin, “I’m sorry, Terri. Guys suck. They really do.” I glanced at my sister then and got up to go back to my room. It was going to be me and my right hand that night since Susan had company.

I put the chair back and turned toward the door. That’s when I heard my sister say, “Wait a minute, Chris.” I stopped and turned back, looking at her questioningly. She was looking at our cousin then.

“What do you think would happen if you magically got better at sucking cock? Would he take you back?” I saw Terri grin slightly then.

“Probably. But what makes you think I’d go back?” She paused and then giggled softly again. “Who am I kidding? I would. He’s really big.” I saw Susan nod knowingly then. She got that. I saw her eyes as they glanced down at my cock. Then she looked back at Terri and smiled again.

“I think I have a solution for you Terri. Chris has a really big thick cock too.” Terri couldn’t help but glance at me herself then. Then she shook her head before frowning slightly and asking my sister, “How do you know that?” Susan just smiled and raised an eyebrow slightly. Terri got that and it shocked her.

“Oh my God! You and your own brother? Jesus Susan, that’s incest.”

My sister nodded at that. “It is, and it’s a lot of fun too. I have a nice big cock right next door whenever I want it.” Terri looked at both of us then. She didn’t look offended or disgusted then, she actually looked curious. “So how big is he?”

“Nine inches, and it’s really thick too.” Susan grinned and added, “I measured it one night just to be sure.”

“That’s bigger than my former boyfriend.” Susan just smiled at her then.

“You’re thinking about it now, aren’t you? Tell me the truth.”

My cousin nodded slowly, looking quickly back at me before telling my sister, “Yeah. I guess I am.”

Susan knew that and with a smile shocked both of us. “Why don’t you show her, Chris? Show her how big it is.” I looked at Susan like she was crazy, then I glanced back at Terri. She didn’t say no right then. In fact, her eyes were fixed on the bulge in my shorts, so right then I started thinking. Finally, I nodded.

“Sure, Susan. But there’s one thing. I’m not going to be the only one naked here. You two have to be too.” Susan got it right away, and so did Terri. She looked shocked, but again she didn’t say no. My sister spoke again then.

“I’m good with that.” She looked at our cousin then and asked, “What about you?” We both could see her considering it before she looked up at me and nodded slightly.

“I guess that’s ok. There’s nothing wrong with getting an eyeful, is there?”

Susan shook her head then. With a smile, she added, “Nothing wrong with getting a mouthful either. Or a pussy full.” Terri blushed at that but giggled.

Susan looked my way again, then asked, “So who’s getting naked first?”

I grinned at them and said, “I will.”

I tossed my t-shirt aside then, before hooking my fingers in my shorts and underwear. I had two sets of eyes on me as I slowly slid them down, revealing my hard cock standing out proudly in front of them. Terri actually gasped then, seeing it for the first time.

“Damn, Chris! That thing's fucking huge!” Susan nodded happily at her reaction.

“You should feel it inside you. You really should.” I watched my sister peel off her clothes then, tossing them to one side. Then it was Terri’s turn. My eyebrow raised as she pulled off her shirt, revealing full, firm tits to my eager eyes. Her hard nipples were a contrast to my sister’s. Susan had dark nipples, while Terri’s were a light pink. I memorized them immediately as I watched her pull those panties off to show us a shaved pussy, just like my sister had.

We were all taking in the view then until Terri asked, “So now what, Susan?”

My sister just smiled at that question. I saw her look our cousin in the eye before she said, “Now what? Anything you want, Terri. I’m sure Chris won’t object.” I nodded myself then and walked over in front of her, stopping inches from her body. I saw her staring at my hard shaft just inches away when I heard my sister say, “Go ahead. Touch it if you want.”

Terri did, reaching up slowly and wrapping her fingers around my hard cock. She squeezed it a few times almost as if testing it before she started stroking me gently. Susan nodded her approval as Terri ventured into something she had never tried before. I heard my sister’s voice again then. “Why don’t you try sucking it, Terri?”

I saw my cousin look at the long hard cock in her hand before she shook her head. Looking up at me I saw her eyes as she shook her head. “I’d just disappoint you, Chris.”

Susan laughed softly at that. “Terri, it took me a while to get that bad boy down myself. And I mean literally.” I saw our cousin's eyes widen at that. Susan asked then, “Want to see that?”

Terri glanced at her and nodded, letting go of my cock then. “Yeah, Susan. Actually, I do.” So my sister slid her ass right up to the edge of the bed and motioned me over. I took two steps over to her, standing then with my hard cock inches from that familiar mouth. Susan grabbed my cock and then looked at Terri.

“This is why you need to practice. Practice practice practice!” She leaned forward then and ran her tongue across the head of my cock before letting it slip into her hot familiar mouth. I saw Terri’s eyes widen as she watched my sister’s lips caressing my shaft as they slid lower and lower. Finally, Susan let my length slide right down her throat easily. Her mouth was stuffed full and her lips were at the base of my hard cock then. Susan even threw in an added extra. She opened even wider then and her tongue snaked out to caress my balls lightly.

“Holy shit, that’s hot!” Terri’s voice was breathy as she watched my sister taking my cock all the way down. She slipped up and off after a few more thrusts, then turned to our cousin.

“It is now, but it took a while to get there. Am I right about that, Chris?”

I nodded. “Yes, you are. She had the basics down. You know, sucking and swallowing. But it took a while for her to swallow my entire length.” Terri was amazed by that. I moved away from Susan then and over to my cousin. “Why don’t you show me what you’ve got?”

She nodded and Susan got the show then. Terri licked the head of my cock like an ice cream cone briefly, then she opened wide and slid me into her mouth. I let her do her best for a few minutes before gently reaching down and stopping her. Her head came back up and she looked up at me as I said, “Ok. I see what your boyfriend was talking about now.”

My cousin looked crushed by that. “I’m sorry, Chris. I’m just lousy at that.”

I shook my head then. “No, you’re not. You just need practice. So let’s try it again. This time make sure your teeth are covered by your lips. And take it slowly, until it hits the back of your throat.” I thought and then added, “And, by the way, don’t lick it like an ice cream cone. Run your tongue over it sensuously. That’ll help too.” I saw her nod, then she started over.

She pretty much copied Susan with her tongue then, sliding it all over the head of my shaft. She pressed the head against her lips then before slowly opening her mouth, letting my length slide in and over her tongue. That was a hundred percent better right away, and as I watched her lush lips slide down my cock again. She started moving then, bobbing up and down and taking as much as she could. She started using her hand then to stroke the rest of me until I reached down and stopped her.

“Don’t use your hand, Terri. Let my cock touch the back of your mouth.” I saw her nod slightly. Then she came back up and slid me deeper. I saw her body jerk as she gagged doing that. Then she came up and off me, looking up as she apologized.

“I’m sorry, Chris.” I shook my head and smiled. “Don’t be. Just let my cock touch the back of your mouth gently. Take it that way again and again, and you’ll find your gag reflex will finally accept it. That’s when it’s really fun.”

I saw her nod then before she asked, “Why is that?”

“Because when it’s all the way down your throat and I cum, you won’t taste anything. Susan likes it in her mouth, right on her tongue so she can feel it and taste it before she swallows. But you have an option at that point.”

I saw her nod, then she went back down sucking me once again. As my cock touched the back of her mouth again and again I noticed something. I looked over at Susan and nodded at our cousin. She looked at her and smiled, seeing her body jerking less and less as she got used to my cock touching the back of her mouth. When she almost stopped, Susan looked up at me and held up one finger. Then the next time our cousin's lips slid down my shaft, Susan pushed her head all the way down.

It surprised Terri and she jerked slightly, but she didn’t gag really. Susan held her head there for a few seconds, then let her up. Terri came all the way up and off me, looking amazed.

“Holy shit! I did it! I really did it!” Susan nodded and grinned as did I. “I had that all the way down my throat!”

“You did.” I saw my sister smiling then as she told her, “Now go ahead and finish the job. Practice makes perfect. Remember?”

Terri nodded and immediately sucked me in once again. She wasn’t worrying about gagging anymore, and it made a difference. She even deep-throated me a few times then, obviously proud of her new talent. She still jerked s little bit when she did, but that would go away in time.

I finally looked down at her bobbing up and down on my shaft. “Better figure out where you want my cum. You’re about to get it.” She nodded, then felt my shaft swell in her mouth. I watched as that blonde head pulled back slightly before I blasted her hot wet mouth with my load. My cock throbbed between those lips as I splattered her mouth with my cum. She gulped again and again, swallowing it all for me that evening. She finally came up and off me again, smiling brightly at me.

“If you do that for your boyfriend, I’m sure he won’t complain at all.” I picked up my clothes then and looked at Susan before pointedly saying, “I’m going to bed now.” I saw her smile and nod, and I figured she’d be in after Terri went to sleep. I headed to my room then and got under the blankets, waiting for her hot little ass to join me. Time went by, though, and it didn’t happen. So I decided to go to sleep then.

It wasn't long after that when I heard my door open quietly. I rolled over then and got a pleasant surprise. It wasn’t Susan walking in, it was Terri and she was still buck naked.

As she sat down next to me on my bed I asked, “So where’s Susan.”

“Asleep in her room.” I saw Terri smile as she said, “I thought maybe we could practice again.” She looked over at the bulge under my blankets and laid her hand on it, squeezing my hard cock again. My hand went to her thigh then, sliding across the smooth bare skin there.

“I love the idea, Terri, but there’s one thing. If that hot mouth goes down on me again, I know me. And I’ll want a lot more than just head.” My fingers brushed her pussy then and her body jerked slightly. She got what I meant then, and let go of my cock before sliding her hand under the covers to find bare skin herself.

“I was kind of hoping you’d say that, Chris.” She pulled my blanket back then, watching as her hand captured my hard cock again. She was stroking me again as she said, “Susan went into great detail about what it was like to fuck you. I couldn’t wait until she fell asleep.”

I was good with that. Terri had a request then. “Show me how you like Susan to do it.” I loved my sister sucking my cock pretty much every way she did it, but one came to mind then. I tossed my covers back and told Terri, “Go down to the bottom of the bed.”

She did and looked up my body then. “Now, kiss your way all the way up my legs until you end up with my cock in front of your face.”

That was new to her, so she tried it. She ended up nestled between my spread legs, her big tits pressing against me then. Her hand was sliding up and down my cock again as she smiled and asked, “Now what?”

I reached down and gathered her long hair in my hand. I used it like a handle that night as I slipped my cock back into that mouth, sliding it deep. I pulled that head all the way down repeatedly, and Terri never even complained. She kept taking me easily then, her lips slipping down to the bottom of my cock as she did.

I blasted her mouth again, hearing her swallow once more. I finally let her up and she came up smiling.

“That was different. I liked it too.” Her eyes caught my still-hard cock then and she smiled. “Now let’s see what more is like.”

“Sure. Climb on and you’ll find out.” She got up and moved, straddling my hips finally.

She was running her hand up and down me again as she looked up. “What do you want me to do?”

“I want you to guide my cock into that hot wet pussy of yours. I can’t cum like this, so go ahead and ride me to your heart’s content.”

She nodded and moved. I felt my cock brushing against a soaking wet pussy then as she guided me up and down it, getting me good and wet. Then her hips settled on top of me and I slipped into a tight wet pussy.

She stopped after getting just the head inside her. “Oh my fucking God! You’re huge!”

I smiled and told her, “Take your time, but you’ll get it all. And I’m going to watch every second of it.”

I did too. I watched her hot pussy take another inch of me slowly. She was moving slower than Susan ever had, taking me an inch at a time and moaning as she did. That wet pussy finally swallowed every inch of my cock and her ass was pressed against my hips. Terri’s eyes opened wide then.

“Oh fuck, Chris. Now I see what Susan meant.” Her hot little ass moved then and I moaned....