I get sexied with 2nd nut flush on 4 flush river, and I'm confused...

[aK13]

Stars 3/6 5 handed
Very nice game. All players are loose. Main villain (SB) in this hand is loose/passive preflop, but will bet any pair/draw on the flop and can get tricky -- seems very ignorant of action on previous streets, position, and hand reading however.

I'm in the BB with K[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/spade.gif[/img]

UTG limps, MP limps, Button drops, SB (villain) completes, <font color="red">I raise</font>, all call.

4 to the flop for 8SB: K[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/heart.gif[/img]
<font color="red">SB bets</font>, <font color="red">I raise</font>, UTG drops, MP drops, SB cals.

2 to the turn for 6BB: 3[img]/images/graemlins/heart.gif[/img]
<font color="red">SB bets</font>, <font color="red">I raise</font>, SB calls.

2 to the river for 10BB: 7[img]/images/graemlins/heart.gif[/img]
SB checks, <font color="red">I bet</font>, <font color="red">SB raises</font>...