I'm kinda worried about seiji's past since he said it was his cousin. He's only now 20, so...

I'm kinda worried about seiji's past since he said it was his cousin. He's only now 20, so I imagine they did that stuff when he was younger so it's possible that it happened while he was a minor...on the side note tho, I'm curious abt the S ex bf and his other subs and their play style