Yaoi sinner's manga / #prequel(1)

First I need to read this after "Don't Stay Gold". This is really a sad story. Yashiro turned to be like that because of the horrible things he suffered when he was just a child. He was rapped and we can see that his parents don't care much about him. And just like that he started to like to suffer physically. He became a masochist. And that was fine until he met Kageyama, this one guy who cared or well had a fetish with his burns. And we see that Yashiro never had a deep relantionship with anyone and people just ignored him. It was a surprise to Yashiro when a random guy starts offering him band aids. And I think he fell in love, for the first time perhaps. But then he suffers, not physically, but because of this unrequited love. And Yashiro knows thats he's lonely, pathetic and disgusting, but hearing that from the person he only has is quite painful and just like that he cries. And he doesn't like that type of pain, because is much more painful than any burn he has. P.S.: And in " Don't Stay Gold" Yashiro still loves Kageyama, although he has that sick obsession in sex and in pain.