Too aggressive with overpair?

[TredWel]

Is three-betting the flop correct? I was trying to get it heads up or at least push out Button to get into position, but I could be convinced of a better line. Then what do you do on the turn? I'm afraid betting turn/checking river has become my standard, almost immediate line to a weak made hand on a dangerous board. Should it be?

Button is a TAG who has played pack at me on several occasions.
No read on SB yet.
BB is ruing the day that I sat to his left. I've been running over him this session. He can be aggressive, but plays poorly overall.

PokerStars 1/2 Hold'em (9 handed) FTR converter on zerodivide.cx

Preflop: Hero is UTG with 9[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/diamond.gif[/img].
Hero calls, <font color="#666666">5 folds</font>, Button calls, SB completes, BB checks.

Flop: (4 SB) 6[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">SB bets</font>, <font color="#CC3333">BB raises</font>, <font color="#CC3333">Hero 3-bets</font>, Button folds, SB calls, BB calls.

Turn: (6.50 BB) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, BB checks, <font color="#CC3333">Hero bets</font>, SB calls, BB calls.

River: (9.50 BB) 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, BB checks, Hero checks.

Final Pot: 9.50 BB