LOVE THE WAY U LIE - MORBY

Mordecai and Rigby are not good for each other. It's always just blaming, cheating, and punching. But it's the lust and butterflying feeling that lures the other in. The others don't really know nor understand what goes on between the two. Only that some nights, for weeks on end sometimes, one is sleeping on the couch after a few shouts from their room. But it's that one night that sends everything off the tracks

(Do you get the vibe?)
Also on AO3