another misplayed middle pair?

[dfscott]

Several questions about this hand.

1) With 66 or below, I'd fold here -- too weak?
2) Is the raise with the middle pocket appropriate?
3) After BB calls, I'm guessing he has something, but nothing great (maybe a pair or a BJ hand). When the flop comes, I would've rather had bluffed with an A (since I raised), but I felt like the K was sufficient. Too aggressive?

Party Poker No-Limit Hold'em Tourney, Big Blind is t50 (6 handed) converter

CO (t1335)
Button (t925)
Hero (t605)
BB (t2315)
UTG (t1355)
MP (t1465)

Preflop: Hero is SB with 7[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/club.gif[/img].
<font color="#666666">4 folds</font>, <font color="#CC3333">Hero raises to t150</font>, BB calls t100.

Flop: (t300) K[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets t125</font>, BB folds.

FWIW, he too forever to fold. I'm thinking he either missed with his pair or hit an undercard and felt like it was no good.

Is this a leak and I just got lucky here?