It all started a few weeks into my second year of college. I happened to mention to my parents that my flat-mate had bailed and that I had a two bedroom apartment to myself on campus. My mom sent my older sister Lara to come stay with me and experience the college life before she considered applying for it the next year.
I hadn't seen Lara since the previous Christmas and I was looking forward to her visit. My big sis was always fun to hang out with. We were pretty close growing up and had always been there for each other. I was going to play host, give her the full tour, and make her feel at home.
She arrived on a Sunday night. I was immediately struck by how much she had changed. She seemed to glow with confidence. She wore contacts and her clothes actually fit her. In fact, she was drop-dead gorgeous. She was in a really good space too. Funny, charming, and positive. I felt an immediate attraction to her as would any man.
That night we stayed in, had a few beers, and got caught up with each others lives. I learned that she had been working for a sports shop which she liked because she met a lot of friends that encouraged her to be more fit. She had joined a rowing club and was competing regularly.
It occurred to me that she really was fit. In fact the impressive size of her leg muscles and the way her firm ass joined with them was just the kind-of lady-shape that turned me on.
"Sam. Are you checking-out my legs?", she asked with a smile.
"Yeah. I can tell you've been rowing, your thighs are finally thicker than your ankles."
"Jerk-wad!"
We always enjoyed teasing each other.
"You don't look too bad yourself," she said, "Seems you might actually have a dim chance of getting laid unlike in high-school when you broke both your arms doing a chin up."
Creative teasing, but totally untrue. I took it as a compliment though that she wasn't mocking my current physique. I had in fact been working-out quite a bit recently and I'm sure she had noticed. Nothing to tease me with there.
"Ha. I can get laid easily enough. It's not going to be easy though with my sister hanging around. I guess the ladies will have to line-up outside for two weeks."
"Why's that? I'm not stopping you from entertaining your lady friends."
"Well you're room is just down the hall from mine. It would be a little... awkward."
"Never stopped you back at mom and dad's house. There were plenty of nights where I overheard you thumping around with some girl. To be honest it usually turned me on. "
"Seriously? Because of what happened... you know... when we got... off together?"
Years ago Lara and I had kind-of experimented with each other. It started one night when we were sharing intimate secrets. We each got horny talking about sex and even hornier knowing the other was too. We allowed ourselves to explore each other's bodies as a "learning experience" because at that point we had neither of us been with anyone else. We never actually had full-on sex but we fondled each other and came more or less at the same time.
We snuck into each others bed a couple of times after that. We'd touch each other and try to cum at the exact same time. I remember how she'd giggle and play with my semen. She'd rub it over her belly and nipples before sneaking back to her room. My sister being so naughty was quite a turn-on.
But I soon realized our sexual attraction was unhealthy. We both knew it was wrong what we were doing and decided that nothing good would come of it. Mutually we agreed to never let it happen again. After that we had a pretty normal brother/sister relationship. Probably a bit better than normal because we had been that intimate and were quite comfortable with each other.
"No. It just turned me on to hear the sound of people fucking. Nothing to do with you really. Don't be so self-absorbed."
A sly smile crossed her face,
"Sometimes I'd even do something about it. I'd go back to my room and take matters into my own hands if you know what I mean."
The thought of my sister masturbating after hearing me have sex got me going. I felt my dick start to stretch my pants. My immediate reaction was to change the topic.
"It's getting late we should clean-up and pack it in," I said as I stood up from the couch with the intent to hide my forming erection in the kitchen.
"Oh he changes the subject. Did I make you uncomfortable?"
She was looking right at me intensely. Her smile and her gorgeous eyes captivated me. I couldn't help but smile back at her. My eyes wandered to the rest of her body. The sight of her soft cleavage and warm smooth skin boosted my arousal. My penis jumped and her eyes darted downwards.
"Oh my god, you've got a hard-on. Did I just give you a hard-on? Holy shit the thought of me fingering myself really get's you going doesn't it?"
"Oh please! Don't flatter yourself."
The fact that she had just said the term "fingering myself" was not helping me control my lust. But I was embarrassed and had to play it down.
"Hey sometimes it just has a mind of its own. I could be focusing on macro economics and I could still get wood. Anyway, it's not appropriate for us to discuss and I'm gonna head to bed."
"Ha, and I know what you're going to do there you sicko. Wouldn't be the first time you came thinking about your sister would it?"
"Hey you were as much a 'sicko' as I was back then. Anyway, the past is the past and I'm not about to fantasize about a dorkette like you. G'night."
I felt flustered as I rushed to my room and forgot about cleaning the kitchen. I was incredibly horny and I did relieve myself with thoughts of my sister in mind. I rolled over with a pool of cum on my belly and fell asleep.
***
"Sam. Sam."
It was two in the morning and my sister's loud whispering woke me up. She was at the doorway to my bedroom.
"What is it?"
"Let's talk."
"Seriously? what time is it..."
Suddenly she slipped under the covers of my bed and I could feel the warmth of her body spread across mine. The sudden intimacy made my penis twitch.
"Lara, oh my god, are you... naked?"
"Yeah. Uh oh.. feels like you did bust-a-nut in here after all didn't you?"
The semen on my sheets wasn't dry yet and she'd obviously felt it on her skin. This unexpected visit felt like an embarrassing violation.
"What the hell are you doing here!? And that's none of your business."
"Your business is sticking to my abdomen. Do you think you've got enough juice to do it again?"
As she said that her hand drifted down and started to massage my balls.
"Jesus Christ!", I sat up and shifted away from her, "I thought we agreed we'd never cross this line."
She took a deep breath and said "I need you to fuck me Sam. I know you're my brother and it's wrong and it's weird but right now that is exactly what turns me on."
"I can't believe this. Alright yes you turn me on and I have fantasized about you. But that doesn't mean we should take it to the next level. If we do this there is no turning back. This is incest. That, and I'm afraid I'll get really attached to you and after these two weeks you'll be gone and I'll have to get over you all over again. You have no right to..."
"Look. That was years ago. I think we can make it work now. We just have to keep romantic feelings out of it. When I go home you'll be stuck here with a campus full of pretty girls and you'll land on your feet. This is a one shot deal and no one will ever find out. Just think of me as your secret fuck-buddy or your cum-rag. What do you say brother?"
I was shocked and doubly aroused hearing my younger sister talk so nasty. It all but eroded my resolve against following-through with carnal incest. But I knew our relationship would never be the same and I told her that I'd feel guilty like I had letter down as a brother if I allowed it to happen.
She wrapped her fingers around my erection.
"Oh please. I'm not just your sister anymore anyway. I make my own decisions. Right now you're not my brother but a rock-hard man who can spill his semen inside me as much as he likes because I'm on birth-control."
With that she positioned herself so that she was straddling my waist with her thighs. I could feel the wisps of her pubic hair tickling my cock.
