Well...let me tell you first that I love this site. It has really helped me masturbate a lot over the years, and build up the courage that I needed to experience this story. I love reading about all the stories of siblings that have had experiences together, and I always wanted to try it.
My younger sister is 4 years younger than me(she's 20) She has always been a 'tom boy' untill she started developing since she was 16. I know that she is my sister, but she looks amazing! Blonde hair, blue eyes, about 110lbs, nicely shaped b-cup little perky tits.....I am getting hard just writing this. She has had sex before only a couple of times so I know she must get those urges. I have come close to trying to get 'caught' masturbating but always chickened out.
So, my room is in the basement, just next to the shower. I had planned this out the night before, so I had closed the bathroom door to set up the plan. When I woke, I stayed in my room so that she thought I was still sleeping. I waited till she had turned the shower off to make it not obvious when I 'accidently' walked into the bathroom. By this time I had a huge hard-on from excited about what's going to happen. So I picked up my towel, wrapped myself up, and just as I heard the shower doors open I walked into the bathroom.
I just stood there acting like I was in shock...but was amazed to see her standing there, dripping wet naked body. At first she tried to cover up with her hands as I apologized saying I did not know she was in there...by this time my dick was soooo hard, and started to stick out. I saw her eyes just staring down at it, and then surprised me by saying that it looks like someones happy this morning and then said that since I seen her naked, I must show her. I totally agreed with her that it was fair and so I dropped my towel. She then began to tell me that she knows I masturbate all the time and that she has heard me a few times, and asked me if I was going to jerk-off in the shower? I told her I was, and she had asked if she could watch. WOW....I said for sure. So we had both climbed back into the shower and as I started to stroke, she had spread her legs and started to rub her pussy. She the reached up and grabbed my cock said she was going to help. she was looking up at me while fingering her pussy and started to moan. The next thing surprised me....she began to jack my dick....it was amazing. I had cummed all over her small lil tits. After she had smiled and said thanks, and got out of the shower as she left she stated she enjoyed it a lot and we should do it again sometime.
I can't wait till we do it again.