Overpair and the top card pairs

[MrOnizuka]

Villain seems pretty loose, and called a 3 dollar raise with 67 with which he busted KK. He's loose, but doesn't appear to be stupid or making moves at a lot of pots.

Ultimate Bet No-Limit Hold'em, $.50 BB (10 handed) converter

MP3 ($28)
CO ($18.80)
Hero ($58.75)
SB ($12)
BB ($12.50)
UTG ($93.25)
UTG+1 ($43.20)
UTG+2 ($22.45)
MP1 ($18.10)
MP2 <font color="#A500AF">(villain)</font> ($36.25)

Preflop: Hero is Button with 9[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/club.gif[/img].
UTG calls $0.50, UTG+1 folds, UTG+2 folds, MP1 calls $0.50, <font color="#CC3333">MP2 <font color="#A500AF">(villain)</font> raises to $1</font>, MP3 folds, CO calls $1, Hero calls $1, SB folds, BB folds, UTG calls $0.50, MP1 calls $0.50.

Flop: ($5.75) 6[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">UTG bets $2</font>, MP1 folds, villain calls $2, CO folds, <font color="#CC3333">Hero raises to $7</font>, UTG folds, villain calls $5.

Turn: ($21.75) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">villain bets $5.5</font>, Hero ???

Thoughts on what to do here? Looks so much like a please call me bet.

1 other factor in my decision was that I'd previously taken the entire time limit to call a bet pot with a K high flush and the guy said I was a pussy [img]/images/graemlins/frown.gif[/img]

A raise preflop might've helped, but its not my standard operating procedure for mid pairs in late position, although maybe it should be.