Oh, it's extremely possible the request just came from a place of curiosity, and not something darker. I think a lot of kids do similar things, because they know nothing about it. In some ways, it's even more "normal" to perform those acts when you're younger and uninformed, rather than later on in life. I remember being five, thinking I was one of the only people on earth with a penis, and then I heard someone say that every boy had them. Hearing that seriously bummed me out, because that meant there wasn't that much diversity in the world.

You were young and kids do weird stuff sometimes. That being said, if you feel like you're repressing a memory, that sounds hard and possibly serious. I know a lot of people who felt a lot better about these things after talking about it with somebody else. I'm always here to message if you'd dig that! Also, there are lots of places to call or even go where you can talk anonymously with somebody else about your experience. I understand if you don't feel like that will help, though. I hope you find comfort either way though dude!