10/20:River nut flush,villain leads out and I just call on paired flop

[an0nym0u5]

10/20 Hold'em (4 handed)
Preflop: Hero is UTG with A[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
<font color="#CC3333">Hero raises</font>, <font color="#666666">1 fold</font>, SB calls, <font color="#CC3333">BB 3-bets</font>, <font color="#CC3333">Hero caps</font>, SB calls, BB calls.

Flop: (12 SB) Q[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, BB calls, Hero calls.

Turn: (7.50 BB) K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, BB checks, <font color="#CC3333">Hero bets</font>, SB calls, BB calls.

River: (10.50 BB) T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">BB bets</font>, Hero calls, SB folds.

Final Pot: 12.50 BB