I may be viewing this wrong, but is there a way to ask your parents to do this with you, like, tell them what you want.

I don't know about this place, but I'm gonna write this. I'm 19, and I've always loved this kind of thing, incest. And I have a brother who I think would be ok with the idea (he also does this stuff, and I know because it's pretty obvious). I'm starting to feel like I want to do that with him, and I don't want to ruin our relationship because I want to try this.