Craig is some kind of monster (dealer's choice as to what, demon/dragon/werewolf/etc) that lives in a cave near a village, and the villagers sacrifice a virgin to him every year in exchange for him not killing them all - usually Craig just lets the sacrifice go in a village on the other side of the mountain, bc he doesn't need or want a sacrifice in the first place, the villagers just keep sending one up there every year. This year, they send Tweek as the sacrifice, and when Craig sees him, he's still going to let him go, but maybe he can have some fun with him first...