Ayrt. I imagine it would start out mutually really angry, then one of them would gain the upper hand and either violent sex would happen and then both versions would feel awful, or the one with the upper hand would be overcome with remorse after giving himself a black eye and possibly broken wrist and give the greatest Apology Blowjob ever. After which the more injured version would be like 'woah, I am actually really good at blowjobs' and go away from the encounter with a little self-esteem boost and a fuckton of excuses to think up.
Probably the first one though. Punching, throttling, hair-pulling, biting, and generally fighting dirty on hoth sides because this fucker doesn't deserve the respect of a clean fight, but then suddenly they're biting hickies onto each other and oh yeah, I kinda like having my hair pulled, but they're angry and they want to make sure their other self can still feel it in the morning.
Re: Matt/Everyone Crack
Probably the first one though. Punching, throttling, hair-pulling, biting, and generally fighting dirty on hoth sides because this fucker doesn't deserve the respect of a clean fight, but then suddenly they're biting hickies onto each other and oh yeah, I kinda like having my hair pulled, but they're angry and they want to make sure their other self can still feel it in the morning.