chapter two was a tragedy? Was that the MPD story, if so it didn't seem to necessarily be tragedy, just that he had multiple personalities and some of them were violent to the uke. The uke liked the violence, didn't he? kinda like S&M, but hard core? abusive, but consensual.
What I consider as the tragedy bit is the fact that the seme cannot recall his life and it's slowly slipping away from him. Wouldn't it be horrible if you were constantly confused, not knowing where you were, how long you've been there or the people you've hurt? S&M wasn't the problem, it's that his life wasn't HIS anymore (that was the problem).
If you thought the tragedy tage was just for chapter two then...
YOU ARE SO WRONG.