My first experience was in my high school days when my girlfriend and I had a surprise visit from her cousin. He walked in on us while we were having sex and decided to get involved. I had no idea he was anything but straight. I was so wrong. I was on top, slowly grinding into her and suddenly felt something wet between my cheeks and his finger enter me. I had always wanted to try anal but was never able to find a partner that I could trust not to out me. This was in the 1980s, and being bicurious wasn’t acceptable back then. Anyway, it felt wonderful. I pushed back on his finger, still inside her, and this must’ve been the go-ahead for him. I felt him get close and he started to try to push his cock into me. I let out a loud moan and she opened her eyes and saw him behind me. This must’ve been exciting to her because she pulled her knees to her chest causing me to go deeper and giving better exposure for him to play. At this point, I guessed that they must’ve talked about trying this but I didn’t care. He was balls deep and I felt a body-wide surge in pleasure. I know now that he was hitting my p-spot which I didn’t know existed at the time. I was amazed. I couldn’t believe how good it felt. I expected some pain but I didn’t feel any. I guess it’s because, although 8 inches long I guess, he was not very thick. I came a few minutes later which started a cascade of orgasms. First, she came. It was her first creampie, she told me later that she was (her words) a-dickted to after that, and then he came inside me. Which I have been “a-dickted” to ever since. That final push that he did, when he came, hit my prostate hard. His throbbing against my prostate. Which caused me to come again. I have never had that happen to me before. Now, I want that to happen to me again and again.