I always go over to my cousin's house after school until my mum picks me up.
I always go straight to the toilet and 'relieve' myself thinking of all the hot girls at my school. Because my aunty works late and my uncle goes on long walks until around 5pm me and my cousin are normally alone until my mum picks me up at 4:30.
One time I got out of the toilet and my cousin (who I will call Anne and is 15) asked me why I always go into the toilet everytime I get there. I asked her if she really wanted to know to which she excitedly replied 'YES'.
I told her that I masturbate and she asked me if I ever thought of her while doing it, so I told her no. She asked me if she could see me do it and I said that I was a bit tired but I would do it for her the next day.
I spent the whole day at school thinking of what would happen that afternoon as my cousin is very good looking and has nice sized breasts.
I walked into the house with a hardon and saw my cousin, she asked me if I was ready. I said yes and we both went into her bedroom. I sat down on the edge of the bed with my pants down around my ankles and slowly started stroking myself. My cousin was kneeling in front of me and watching very closely, I asked if she wanted to help me a bit so she started to rub my penis. She used both of her hands wrapped around me and got me to the edge very quickly. She pulled up her t-shirt and let me fondle her and told me to cum on her tits. I stood up and let loose stream after stream of cum on her tits then I moved up to her face.
Anne then asked me if I could help her out because she masturbated every night but couldn't orgasm. She laid down on her bed and I lifted up her skirt and pulled down her panties. I put my fingers in her pussy and fingered her a little and then when my fingers were lubed I started rubbing her clit, all the while she was moaning and urging me on, then she came.
She slowly started breathing normally and told me that her first orgasm had been the best thing she ever experienced.
Anne looked down and saw that I was hard again and asked me if I was ready to go again. My response to this was to climb up on top of her and putting my penis in between her tits. She said that I looked really good from that angle and I slowly started to pump away and eventually came, but not as powerful as the first time.
I then got dressed and had 10 minutes to wait until my mum came and picked me up. Anne and myself had sessions similar to this every day afterward.