My Step-sister....

One night I was put in charge of watching my sisters while our parents stayed at there friends to party, I was 15 and they were 12 and 13, we played games and such on the computer some arctic bear bowling thing.... any ways after a few hours of this game we ended up making a fort and laying out some thick blankets to lay on. I must say.... that was one bad *** fort, I might stay in it now if I had the chance! :D we played around in there and they were both getting tired but didn't want to go to bed.... after about 10 mins, the younger one passed out on the floor not more than 15 feet from a comfy bed, it was our parents king sized, pillow top! (Soooo Soft) I picked her up and put her on their bed since they wouldn't be home that night. My other sister seeing this realized how tired she was as well, she layed next to her sister and I went into my room, to go to sleep. About 20 mins later, the older sister, came into my room and woke me up. She told me how she couldn't fall asleep and wanted me to lay with her, I said I would until she fell asleep then I was going back to my room. well I ended up falling asleep almost right away.
I woke up in the middle of the night, trying to figure out where I was. When I realized that I had fallen asleep, I noticed that my sisters hand was down my shorts that I was wearing that night.... Her hand still partially around my d1ck... I wasn't sure what to think... but I started getting hard at the thought of my step sister having been playing with my c0ck. I don't know how long she was doing it. I decided that I wanted to make it fair so I pulled her nighty up, showing her tight little pu$sy... I was amazed that she wasn't wearing them. I started thinking that she had planned this... so I slid beside her legs and touched her pu$sy. No movement, but she was still very wett! She must have just gotten done or fallen asleep massaging my member! I still had her hand around my, now swollen, c0ck! So I gently grabbed her arm and started making her begin to rub me off! As I do this with one arm, I use my other to slowly rub the lips of here tight tw@t! She got wetter and wetter, without even meaning to my finger slid in. Shocked I laid back quickly and pretended to be asleep! She only moved a little, so I got brave and went back at it.... but this time putting my finger in on purpose..... slowly finger f-ing here, all this time I keep an eye out for my younger sister to wake up too!
After about 10 mins of this I finally blew my load some of it landed on her face. She twitched a little, and I again pretended to be asleep for a few mins until I felt that it was all clear... I wiped what I could see of it off and went to my bedroom and went to bed..... I still haven't bought it up to either of them.... mainly the oldest of the two about why I woke up like I did.... I may never know, but the experience was really exciting! Hope you enjoyed my little story.... :D It feels good to have it off my chest....