TPTK getting raised

[awarunn]

Villain is 52/3/0.9 over 100 hands. No notes on any hands he's showed down, which I usually look for.

Full Tilt No-Limit Hold'em, $1 BB (5 handed) Full Tilt Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

BB ($61.60)
UTG ($100)
MP ($162.55)
Hero ($155.25)
SB ($68.35)

Preflop: Hero is Button with Q[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
MP calls $1, <font color="#CC3333">Hero raises to $4.5</font>, <font color="#666666">2 folds</font>, MP calls $3.50.

Flop: ($10.50) 9[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
MP checks, <font color="#CC3333">Hero bets $10</font>, <font color="#CC3333">MP raises to $40.5</font>, Hero ??

The board is drawy but this guy's aggression factor is pretty low so I wouldn't expect him to be raising draws or bluffing here. I could see him having something like Q9 since he's so loose. What's my line?