AK 3b pot OOP, flop fd, wiff turn, how to proceed

[DirteAA]

Villain was running about 27/19/2 over 300ish hands and may think I like to bluff. I had 3b him a couple orbits earlier w/ QTs and cbet a flop of J 8 3 rainbow, he called flop w/ AQ and we checked turn and river.

I am running about 22/17/3 over 80ish hands at this point.

How should I proceed on this turn?

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.50/$1
6 players
Converter

Stack sizes:
UTG: $150.55
UTG+1: $39.50
CO: $98
Button: $177.30
SB: $99
Hero: $104.15

Pre-flop: (6 players) Hero is BB with A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/diamond.gif[/img]
3 folds, <font color="#cc0000">Button raises to $3.5</font>, SB folds, <font color="#cc0000">Hero raises to $13</font>, Button calls.

Flop: 9[img]/images/graemlins/club.gif[/img] 6[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] ($26.5, 2 players)
<font color="#cc0000">Hero bets $21</font>, Button calls.

Turn: 8[img]/images/graemlins/spade.gif[/img] ($68.5, 2 players)
Hero has $70 left