I was 13 and my best friend was 14 when my grandma caught us both together blowing each other's dicks. We had done it many times before and it didn't mean that we didn't like girls. But they weren't into that sort of thing at the time. It was a shock when grandma came in the door. It was the first time we got caught. Before that it only happened once, at his house, but that was his little sister, she's only 7 and she does everything her big brother tells her to. That's why she didn't tell on us. But now we were caught. Grandma stood there with her mouth open and stared at us. And our stiff ones were not so stiff anymore. I tried to think of something to say to Grandma, but I couldn't think of anything clever to say. She sent my buddy home and then took me into the kitchen. And then she started asking me questions. Whether I was just into guys. If it's more fun with a boy and so on. In the end, it all came down to whether I was gay. She left me alone for the rest of the afternoon. But after dinner, she told me to wash my hands and then come to her room. When I entered her room, my grandmother was lying on the bed in an almost transparent nightgown. Again she started asking questions. Whether I had ever had a girlfriend before. If I had ever seen a naked woman. If I have ever touched a girl, or just boys. Same old story. I was standing next to her bed and she was leaning on her elbows. I could hardly take my eyes off her breasts. I wasn't sure if they were visible through the fabric, but what I could see were her nipples. They were clearly visible under the nightgown. Until then I only knew the little things of my mate's sister, but with her 7 years she had nothing to show for it. Although her little nipples got hard when you touched them there. Apparently, my grandmother didn't make it necessary to touch them. They were already clearly visible. And I noticed that I slowly got a hard-on in my pants. My grandmother didn't miss that either. She suddenly smiled and pulled the front of her nightgown off. She took my hand and put it on one of her breasts so that I could feel her nipple in the palm of my hand. I gradually became hot. Grandma suddenly said, "It seems to me that you're really not gay" and she put her hand on the now clearly visible bulge in my pants. I don't remember what happened then. That means, of course I know it already, but I have no explanation why it happened. I unbuttoned my trousers and took out my stiff member and my grandma sat up and pulled her nightgown over her head. I could see that her breasts were hanging down quite a bit, but after all, she was almost 70 and she had 3 children, all of whom she had probably breastfed. I didn't think it was too bad at that moment. Somehow it appealed to me. My hands automatically went to her breasts. I touched them, stroked them, even her nipples. It was all new for me and I didn't want to hurt her. Her hand was quickly on my willy. She seemed a bit hesitant, but she already knew how to handle it. My grandpa had been dead for about 10 years and I have no idea if she had a boyfriend after that. Anyway, her hand on my penis felt much better than my buddy's. She also had the right grip on it and she never pushed your foreskin back so far that it hurt. My buddy wasn't very good at it. Grandma sat on the edge of the bed in front of me and I had to put my member between her breasts. And she didn't just have such small. Grandma's breasts weren't huge, but I could put my member between them and when she pushed her breasts together, there was no sign of my member. And then she wanted me to move my member back and forth. That felt really good, because it was covered on almost all sides by grandma's breasts. It was funny to see my glans appearing over her breasts every time. And it didn't take long before I felt it was happening to me. I told Grandma, but she just turned her head a little to one side. When it came to me, I sprayed everything on her neck and one cheek. I've never masturbated this far before. I had never thought that of my grandmother, but it was really super cool! If she does it again with me, I will ask her if I can have a look at her vagina.