My relationship with my sister, Lacey, was always a little weird. She was never planned. My mom had switched to a new type of birth control, and messed up the dosage. This resulted in a 10 year age gap between us.

Lacey always seemed to idolize me. When she was 6 years old, she would tell everyone that she was going to marry me. Being 16 years old myself, this was not appreciated. To add to this, she would often sneak into my room at night and sleep in my bed. Her messing with my privacy made it very hard to take care of personal business. Jacking off was just never an option when she was around, because she would be glued right to me. My opinion of her should be pretty obvious. I thought she was an annoying brat. This all changed when she turned 12.

At this point, I'm 22. I'm decently tall, at 6' 4". I'm not particularly buff, or athletic, but have just enough mass to not look all odd and lanky. I keep my light brown hair cut short. Lacey is a short 5 ' even, with waist length dirty blonde hair. She is pretty skinny, but not a twig by any standards. At this point she had almost nothing in the ass department, but had 2 small lumps for breasts that just barely qualified for a training bra.

Our parents were out of town for the weekend, and left me in charge. I was enjoying a late shower just soaking in the heat. I had just finished shampooing and was considering knocking one out. I had had much of a chance to jack off the entire week. As I begin stroking my shaft I notice something out of the corner of my eye. The bathroom door was open, and standing there watching me was Lacey.

I. Was. FURIOUS. One of my last bastions of privacy, and she had decided to invade it. Without even thinking, I stepped out of the shower and yelled at her.

"What are you doing in here!"

She just looked down at the ground. That's about when I realized that I was yelling at her while I was naked, wet, and with a raging hard on. I also realized something else. She wasn't getting anything from the bathroom, and we had another bathroom in the house if she had to go. The water was running for a while, so it's not like she walked in by accident either.

"Were you watching me?" I asked in complete confusion.

A nervous "umm" was the only response I got.

At this point I had no idea what to do. I looked her up and down. She wasn't unattractive, but I had never thought of her as anything other than my annoying kid sister. Now though. My cock gave a tiny twitch. Almost like a seal of approval. That's when I uttered the line that would forever change my relationship with my little sister.

"Take off your clothes."

Now, I'm not sure what reaction I expected from her. Maybe she would yell no. Maybe she would act disgusted and storm out of the room. Maybe she would be confused and think she heard me wrong. Nope, none of those. She did the one thing I never expected. She complied.

She didn't act giddy about it. She didn't act disgusted, or like she was forced. She was virtually emotionless as she started to remove what she was wearing. It didn't take long. She was only wearing 2 articles of clothing. An old grey T shirt of mine that had my high school's name printed on it that went down below her knees. That came up and off to reveal only a single pair of small pink panties.

Once again I thought there would be some form of hesitation. Maybe for her to wait until I told her to take them off. Once again she surprised me. As soon as my old shirt hit the floor she started to pull off her panties. I could never confirm it, but I'm pretty sure the sight of her small hairless pussy actually made my dick grow another inch that day.

At this point I was at a loss. I had no idea what I wanted to do. One part of me wanted to fuck her brains out right there, but another part wanted to fuck her harder. There was still that tiny thought in my mind, telling me that she was my sister, and that she was only 12, but it went largely ignored. For some unknown reason, at that exact moment, I realized that I never finished my shower, and stepped back in. I then turned to Lacey and beckoned for her to join me. At this point it should go without saying, but she walked in without the smallest hint of hesitation.

So there we were. Me and my 12 year old little sister standing in the shower getting completely soaked. My dick was ready to burst at this moment, and I think it would have without any interference. The sight of the soaking wet preteen in front of me was possibly the most amazing thing I had ever seen. For the first time in my life, I was truly contemplating fucking my little sister. What would it be like? How much of my penis could I fit in her virgin cunt? Those lips had the smallest little pout to them, what would it be like to have them wrapped around my dick?

While thinking all this, I see her shyly sneaking peaks at my erection. Before I can even consider what I'm saying I let out a low quiet moan, uttering "touch it".

Now I wish I could say I lasted for a while during this impromptu handjob, before moving on to do everything possible to her in that shower stall. That's not what happened. It took all of 2 strokes before I sprayed stream after stream of my seemingly unending semen from my slowly softening shaft. When this happened I closed my eyes and moaned in pure pleasure. When I opened my eyes again I was greeted by a vision that would make even the most pure man go from flaccid to orgasm instantly.

There was Lacey, soaking wet, covered in my cum. From her waist all the way to her lips, she had bits of my jizz on her. I scoop some of it off of her and hold it up. As I did, I came to my senses. This was my sister! I can't do this. I have to go. I turn away from her and step out of the shower. I dry off and leave to my room where I immediately get dressed. A few minutes later I hear the shower turn off, followed soon by the closing of her bedroom door.

I sat for a while thinking about what had transpired. I realize that what happened, happened, and there was no taking it back. I knew Lacey wouldn't tell on me. I decided that I would just ignore it. It was all I could do. With my mind still reeling, I called up some friends and left. While going to meet up with them I promised myself that what happened in the shower was a one time thing. That nothing like it would ever happen again. The promise didn't even last a night.