I'm not 100% sure the context (or if it really even happened) as I was quite young, but I have this memory or dream or something that keeps sticking in my head. For context; I am 24 m, my second cousin is about 10 years older than me and lives out of state, I believe that I was between 4 and 7 when this took place. Whenever I'd see my cousin I'd always nut tap him or kick him (the first time was an accident, but my whole family thought it was hilarious so I kept doing it looking for the same reaction), and I'm not sure if that had something to do with it. I remember we were at my grandparents cabin and the whole family was there. My cousin, my brother, and I were hanging out in the bedroom. At some point, my brother went to take a shit. My cousin got up and locked the door behind him. The next thing I remember, we were on the bed naked. My cousin said something along the lines of "see were just alike." He then made me touch his erect penis. I remember feeling super uncomfortable but not knowing what to do. I don't remember if he touched me at all. Then he whispered in my ear that this would be "our little secret." I didn't (and still don't) know what would've happened next, but luckily we heard my brother coming back to the room. We got dressed as quickly as we could, and my cousin unlocked the door after my brother had been knocking for some time. He played off locking my brother out as some kind of joke. I've never told anyone about this until now.

Edit: I really feel like I should tell someone irl, but idk who or how. Does anyone have any advice on bringing up such a sensitive matter?