- You raise to $12 (pot is now $23). This is barely above a minraise. The opponent now needs to call off $7 to win $30... or he has to call off 23% of the pot when he has somewhere in the neighborhood of 20% chance to "win" the pot on the turn.
Quick note, when calculating pot odds, you don't add the amount of the call to the pot. Villain had to pay $7 to win ~$23, not $30.

Raising the flop stronger ($18 or $20 seems good and even, enough to make him commit most of his stack to a flush draw, something most players don't want to do) seems like it could diffuse the situation rather quickly. TPTK is not really a hand I want to take to showdown unless I know Opp has a weaker ace.