Not sure it was molestation. They were both minors around the same age and it was consensual even if it was twisted, Jun never rejected him until he left the house.
We can't arrest kids for having sex with each other.
Idk, with young kids the lines aren’t entirely clear. It really depends on the difference in age. A lack of rejection and being around the same age doesn’t constitute consent.
Though I do agree with you, the fact that the brother had some kind of psychological ascendant on him makes it unclear whether the sex was totally consensual or not, well it's a true question even irl...
Sadistic uke was interesting, at the time when the seme strapped the brother I was like “wtf” because I was expecting it to get wholesome for some reason. Weirdest way of dealing with being molested as a child I have ever seen. I liked the first half of the manga at least.