100 PL: TPTK Vs LAGS

[crunny]

CO is 34/15 and aggressive post-flop
Button is 33/20 and also aggressive post-flop

PokerStars Pot-Limit Hold'em, $1.00 BB (7 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

SB ($24.40)
BB ($98.95)
UTG ($56.90)
Hero ($97)
MP2 ($21.75)
CO ($153.75)
Button ($89.50)

Preflop: Hero is MP1 with K[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $3.5</font>, <font color="#666666">1 fold</font>, CO calls $3.50, Button calls $3.50, <font color="#666666">2 folds</font>.

Flop: ($12) 2[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets $8</font>, CO calls $8, <font color="#CC3333">Button raises to $17</font>, hero???

CO could be calling with almost anything here.
I think BTN will usually raise with sets, 2pr and Top pair. He might also raise with under pair or draws but not as likely, IMO.

Whats your move?