NL50 15-out draw facing a push, clear call ?

[Elrohir]

I just took vilain's stack, he rebough for $40 and is really tilting. Since he rebought, he limps in every pot. He's 81/20/1 over 59 hands.

Stacks : he's ~$40 and I cover him.

The hand :
I have AcKc
PF : he limps, I raise, BB calls, Vilain calls.
FLOP : 9c 6c 2s
it's checked to me, I bet ~80% of pot, BB folds, Vilain raises all-in (it's seven times my bet).

I put him on a pair or a draw : I'm a 52% favorite against a pair : clear call or wait for a better spot since I have just $7.5 invested ?

[RAHZero]

I call, given the read he could easily have a worse flush draw or 78 as well. Unless he has a set, AA or KK, calling here is +EV, and I'm not going to give a tilting 81/20 credit for those hands in this spot. Calling is high variance, but I think definitely correct given the context.