Turned Set with 3 to flush on board

[soberforlife]

PokerStars No-Limit Hold'em, $1.00 BB (6 handed) internettexasholdem.com

CO ($96.45)
Button ($115)
SB ($110.75)
BB ($100)
Hero ($138.50)
MP ($53.50)

Preflop: Hero is UTG with 7[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/club.gif[/img].
<font color="#CC3333">Hero raises to $4</font>, <font color="#666666">1 fold</font>, CO calls $4, <font color="#666666">3 folds</font>.

Flop: ($9.50) 5[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $7</font>, CO calls $7.

Turn: ($23.50) 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero ?

Also how do I respond to a raise here if I bet out?

Vil. is 31/13/3.5

[Chaostracize]

You call if he pushes, and reraise if he raises. He will very rarely raise here. Therefore, VB river.