Pump this flop with an overpair?

[Azhrarn]

Weird table. It's been playing loose and aggressive before the flop, and normal postflop.

Party Poker 3/6 Hold'em (10 handed) converter

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

Flop: (26 SB) 4[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(7 players)</font>
SB checks, UTG+1 checks, UTG+2 checks, <font color="#CC3333">Hero bets</font>, CO calls, <font color="#CC3333">Button raises</font>, SB calls, UTG+1 calls, UTG+2 folds, Hero calls, CO calls.

So who three-bets here? The board is semi-coordinated, and at least three of my opponents seem to like their hand a lot. Since there was a lot of cards I didn't want to see on the turn, I decided to just call, and bet out again if the turn bricks (if it's checked to me.)

Turn: (18 BB) K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(6 players)</font>
SB checks, <font color="#CC3333">UTG+1 bets</font>, Hero calls, CO folds, Button folds, SB calls.

My read on UTG+1 is loose and straightforward, which means I'm 95% sure he has the flush.

River: (21 BB) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">UTG+1 bets</font>, <font color="#CC3333">Hero raises</font>, SB folds, UTG+1 calls.

Final Pot: 25 BB