My name is Chris, and I'm 17 years old. 6ft tall and not what you would call "fit."
I was sat on my bed, with my laptop beside me, reading through some erotic stories, and masturbating, naturally.
I was a virgin, and hadn't even seen a girl naked in front of me, so I was rather inexperienced. Of course, I had a few ex-girlfriends, but nothing huge.
I settled in to a good lesbian story, and stroked my less-than-impressive 6inch cock, preparing myself for my orgasm.
After a few minutes, I heard footsteps on the stairs outside my room, but thought nothing of it. My parents have their room on the top floor, and often walk up and down between there and their office. As I continued, I heard my door creak
open slightly. My door does this all the time, and shuts itself after a while. 30 seconds passed, and my door didn't shut, so I looked over. I noticed my sister standing there, watching me. I froze.
"Jesus Christ, Jay, don't you knock!?" I shouted.
My sister walked in to my room, "I'm sorry, Chris, Mum just told me to tell you her and dad are going out for a bit" she said, her eyes fixed on my hard-on.
My sister, Jasmine - or Jay for short - is 19, 5ft 2" with large breasts. They must have been at least 32D. I always thought she was kind of cute, but in a brotherly way. She didn't have many guys on her tail because she was very dark and secretive.
"That's very nice, anything else?" I retorted, looking at my sister's eyes. I could tell she was slightly attracted to me, but I didn't think it was in that way.
My sister leaned over, giving me a clear view of her cleavage, looking at the screen, her head inches away from my cock.
"What'cha reading?"
"A-an erotic story..."
"Oooh... sounds... long..." her eyes never moved from my erection. She had a look of lust in her eyes. Before I had a chance to say anything else, she ran out of the room.
"That was weird" I thought, continuing reading. I looked over to the navigation of the site I was on, and saw an incest category. I was suddenly turned on more than I had ever been before, and I started reading through the stories. Every time I read a brother and sister story, I imagined my sister and I being in the situations.
This made me so horny, and after a while, I had my best orgasm ever.
After I had cleaned up the mess I left, I headed for the shower. We only have a shared bathroom, and we don't have a lock, so there have been a few embarrassing incidents when I was younger.
I hopped in to the shower and started the water running. After a while, I heard my sister knock on the door.
"Chris, is it okay if I use the bathroom quickly?" she said, urgently.
"Sure, I'm in the shower, just make sure you don't flush."
"Okay, thanks!"
I heard the door open and close, then the soft footsteps across the linoleum floor. I noticed my sister sitting on the toilet through the frosted door, but I didn't hear anything. Was she just watching me in the shower?
"Are you actually doing anything, or just watching me?"
I heard her gasp softly, realizing she'd been caught out.
"Uh, yeah, I am! I mean, I'm doing something."
"Well, what are you doing?"
I heard her moan softly.