I was 9. My cousin was mid teen, 15/16. he showed me a video of a woman blowing a man, that was the first actual footage of any sex I’d seen, a magazine or two prior. I remember being mesmerised, and asked for it to play again. Shortly after my cousin showed me that he was hard. That was a shock, I’d never seen an erect, mature penis until that. First that video, then my cousin, it interested me more than it should have. Later that night, I slept over on a mattress in his room. Can’t remember what brought it up but he was hard again, I asked to touch it and he let me hold & squeeze it. Soon I was over in his bed, sucking my older cousin’s cock. I remember very clearly being eager, excited, enjoying the new feelings, taste, and sensations of it. I stopped, then a while later pulled his pants down and started again. I liked it. He came almost instantly which shocked me, but I swallowed it instinctively, as best I could.
That made me see the world a little differently. Certainly I saw my cousin differently. We ended up fucking until I was about 23.