I was visiting my step-sister for a while... She was away from home at the time so I was waiting around for her to return. My nephew, her step-son, entered the room, looking for a blue notebook. I didn't see his notebook, but noticed that he was walking really funny so I got curious and asked about it. He's shy, so didn't open at first, but then I found out that he kissed a girl at school and wanted to push things a little bit further, but the girl wasn't prepared for it, so this entire experience left him blue balled! Naturally, I asked him why doesn't he masturbate, only to find out that my step-sister has forbidden him to masturbate and he's naive enough to listen to her! I mean, I knew that my step-sister was always the good girl and that she's very prudish when it comes to sexual matters, but to forbid her young step-son to masturbate?... This is either cruelty! Anyhow, I felt a lot of pity for him, I, as a woman, can imagine the pain he bears, because I live that experience monthly and I read somewhere that it's similar. I wanted to help him... badly. I needed to do it in a way that he'd be okay with it, not lecture me about masturbation, recycling the sentences of his step-mother. So I told him about a miraculous cream, with strawberry scent, saying that it has a cooling effect and I can massage his cock and balls to help it better get into the skin. The cream was lube, of course. He get hard in a few seconds, exactly like I expected and I kept rubbing it, decided to make him cum, especially after I had to take a look to those swollen, red balls. The taboo thing here is that I got carried away, I got horny in the process and when he suggested to have sex I was immediately up for it! I rode him for a while, Reversed Cowgirl Position, so he can have a look at my round ass. He was so horny we had to stop or go very slow several times, because he was on the edge of cumming every time! I came twice riding him and that was too much for him already, so I though why not do something special for him today? A BlowJob with a lot of sloppy, juicy DeepThroat seemed the best solution to empty those balls quickly and in a pleasant manner. I sucked his cock until he came in my mouth and on my face, he had an impressive quantity of cum in those balls, poor boy!...