i caught my granddaughter playing with her pussy a year ago. She was 9 at the time. She laid on her belly on the couch and rubbed herself hard while cartoons play in the background. i would stand where she couldn't see me and jack off while watching. One day her brother was with her in the living room and she started humping the arm of the couch. I happened to be walking by, and ducked out of sight right quick. Her brother, 15 years old, was watching and starting to rub the obvious buldge in his pants. He asked her what she was doing and she said she didn't know, it just felt good. My dick was getting hard just listening. He asked his sister what else she does that feels good. She pointed to her crotch and said she rubs it there too. Can you show me he asked. She laid down on her tummy and started rubbing. turn over he urged her. She did. She was laying with legs open and her hand inside her shorts and panties. She was rubbing like crazy as her brother watched. after she was done she got up and walked out. I took my chance. I walked into the living room and told my grandson I needed to talk to him. I told him I watched everything that just took place, that I saw him rubbing himself while watching his little sister masterbate. He looked terrified and guilty. I finally smiled at him and told him to take it easy. I said we would work something out and his parents need not find out. i told him that i wanted to watch from now on anything he does with her. He reluctantly agreed after I mentioned how I'd hate to have to tell his parents what I saw. i told him to get her masterbating again, but to help her this time. I told him to help her feel good and I'd teach him how to get her to make him feel even better. The next day after school I watched as he convinced his sister to sit on his lap while she masterbated. I stood around the corner jacking off watching him grow hard with her little body wiggling around on his lap. He told her he needed to help her and started rubbing her crotch with his hand. I saw his dick get rock hard and stand straight up as soon as he touched her little pussy. he grinded her into his lap as he played. A few days later i walked in to find him licking her nipples. Every few days he went further. One afternoon I saw him eat her out. she was laying on the sofa as he held her up under her knees with her little pussy in his mouth. My granddaughter just loved it. She oooo"d and coooo"d as he licked her. i spent most afternoons watching him lick and touch her while I jacked off. The best was watching her take his cock in her mouth. he would cum so hard and so fast, pulling out of her mouth and shooting his sperm all over her little chest. I erupted watching this.