Boyfriend is the love stat, master is the obedience stat (she will actually ask you to take more control, just not put a name to it, later she calls you master), and FWB is the inhibitions stat, which was poorly named, should have been called... exhibitions? Exhibitionist? Uninhibited? Something like that. Or, if you want to call it Inhibitions, then make it start full, and slowly drain as you corrupt her.
Something I've been thinking about is that though they never straight out mention it, your character also learns to control their ability, being able to turn it off. I'm not referring to addiction, I mean his ability to negate powers.
See, in the beginning, Kitty can't use her powers when in contact with you, she bounces off. And Emma also states she can't read your mind (which indicates that your power isn't limited to those you touch). But later on Kitty gives you a handjob while phasing, and Emma sends you a telepathic message while giving you a psychic blowjob ("To me my X-Man", which is actually unlocking a pet name, I think).
So my problem is trying to work out actual rules for his power, when it seems it is just following the "rule of cool." My best way of working around this is that just as you help Rogue gain control of her powers, maybe Kitty of Emma work with you to learn to control your powers.
What do you people think? I'm just trying to work it out for... reasons.