overpair, huge pot, 1st to act after capped 3-way flop

[ellipse_87]

Button is 38/21/1.65 (80 hands); MP is 44/5/0.5 (61 hands).

Party Poker 1/2 Hold'em (10 handed) converter

Preflop: Hero is MP2 with K[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/club.gif[/img].
<font color="#666666">4 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">MP3 3-bets</font>, <font color="#666666">1 fold</font>, Button calls, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero caps</font>, MP3 calls, Button calls.

Flop: (13.50 SB) 9[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">MP3 bets</font>, <font color="#CC3333">Button raises</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#CC3333">MP3 caps</font>, Button calls, Hero calls.

Turn: (12.75 BB) 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
??? -- My intent on the flop was to raise 1 bet back to me. The raise by button was worrisome but gave me an opportunity to protect. After it's capped on my left, what's the plan of action for the turn? And are there any arguments against the flop 3-bet?