AKs - a confusing spot on flop

[shortline99]

Villain is a lovely 51/4/0.5. How should I be best responding to this flop donk?

Full Tilt No-Limit Hold'em, $1 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

CO ($187.25)
Hero ($171.60)
SB ($130.15)
BB ($39)
UTG ($100.60)
MP ($100)

Preflop: Hero is Button with K[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">CO raises to $3.5</font>, <font color="#CC3333">Hero raises to $12</font>, SB calls $11.50, <font color="#666666">1 fold</font>, CO calls $8.50.

Flop: ($37) T[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets $10</font>, CO folds, Hero ???


If I simply call, what is my plan on a turn of Ace or King? A blank turn?