I thought this too and then I re-read it and I realized he was always a crazy fucking bastard.
like fr i dont remember entire story cause the author had a break as you should know, and now i dont know if he was like this from the very beggining or just started being like this cause of some unexplained reasons and jelaousy;//
Uh it's pretty simple. Childhood trauma and the redhead constantly wanting to rape his lover and it went overboard when they drugged him. I'm not sure if your reading the same story but it's plain to see why he's acting like this
（￣へ￣）
whats happening to him really, he was so cool and cute before and now hes acting like a super fcked up crazy bastard