AKs checkraised for the nut flush draw. We're pretty deep.

[criminaldave]

Villain is 18/15/3 over 200 hands but his stats aren't telling the full story. He has been really aggro post flop with almost every hand raised or 3-bet. He has been caught with his hands in the till once already. I'm still adjusting to 200nl so I'm probably playing a little weak-tight but so far I have only showndown the goods. What do I do on the flop here?

PokerStars No-Limit Hold'em, $2 BB (4 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Button ($247.40)
SB ($41.75)
BB ($367.05)
Hero ($411.15)

Preflop: Hero is UTG with A[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">Hero raises to $6</font>, <font color="#666666">2 folds</font>, BB calls $4.

Flop: ($13) 3[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $10</font>, <font color="#CC3333">BB raises to $38</font>, <font color="#CC3333"> Hero should...?