Typical situation

AK/AQ, we raise early limps and 1 of them calls or we just or get single caller in SB/BB.

Flop comes A63 with flush-draw and EP player donks about 2/3 potsized bet.

We know about opponent that he likes to bet his draws OOP (maybe hoping to fold out possible pocket underpair). He won a big pot from tight table coach after his A6s busted Kings on 664 rainbow board. He checkraised his trips and called when a nit pushed the flop. We don't know how our opponent plays monsters on drawing board.

Question:
Raise the flop? Call the flop and evaluate turn? Turn-screw him? What's the best option?

If he is indeed semibluffing and betting his draw, then the "Theory of poker" says to give it to 'im. Reraise him, and if he stays in the hand any longer on a draw, it's his mistake.

If he reraises, I think you've gotta flat-call it, and hope (if he's weak) that you have him outkicked. If he's good, watch out and be careful he didnt flop a set. (Though I won't go broke here, you might lose a bit of money raising to find out what he's got) Evaluate the turn.