Party big draw oop

[BadBenOni]

http://www.pokerhand.org/?1610507

Not sure how to play this on flop,
can bet, check-call or check-raise.

Also I think his call was terrible,
I can play a set like this to get the flush draws to fold.
Or the other caller can be slowplaying top set.
So he is 50-50 at best but often nearly dead.

How do you play this ?