So my beautifully psychotic brain has been yearning for this RP. Not for the faint of heart...
A psychotic serial killer:
Played by Cillian Murphy

finds and takes under his wing:
Played by Michael Pitt

He's dominant, a teacher, and a mentor with a beautifully psychotic mind who finds a thrill like no other by torturing and killing people. In particular a piquerist (one who finds sexual pleasure in stabbing others). He finds the other and realizes he's broken too and takes him in with the intention to teach him, eventually developing further feelings for him. The submissive character is aroused by such as piquerism but mostly finds his mentor erotic and soon falls deeply in love, overcoming any revulsion he has just to see the lust in his lover's eyes.
I can play either role. While I love sex, I would appreciate it coming naturally. I would like quite a lot of RP in this RP, if you know what I mean.