Are you playing to win it all or do you wanna make sure you have at least 2nd locked up? The SB's stack is pretty short, and the BB has you covered, so this is a tough call. Personally I think BB has a pair with a flush draw. Maybe he has a set and is afraid of the flush, or just top pair. If you're going for first, I push here, otherwise just call here and see what happens on the river. I don't see myself laying down AA here, maybe if another heart comes on the river, then MAYBE.