Play AK with me against a loose/passive(ish) player

[Acehawk74]

Villan is 50/9.5/12.5 (VERY agressive on Flop (12) and Turn (8)

Seen villan show down some nasty hands, however when he bets on the flop or turn, he at least has had one pair (from bottom to top) in the 9 times that I saw his hand.

What is your action on the turn, and why?

Preflop and flop comments welcome, as is any other input.

Thanks in advance.

PokerStars No-Limit Hold'em, $0.25 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

saw flop|<font color="#C00000">saw showdown</font>

CO ($22.15)
Button ($10.35)
SB ($28.80)
BB ($46.05)
Hero ($47.70)
MP ($24.65)

Preflop: Hero is UTG with A[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
<font color="#CC3333">Hero raises to $1</font>, <font color="#666666">3 folds</font>, SB calls $0.90, <font color="#666666">1 fold</font>.

Flop: ($2.25) A[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $1</font>, <font color="#CC3333">Hero raises to $3</font>, SB calls $2.

Turn: ($8.25) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $5</font>, Hero ???