50 NL, over cards and nut flush, what to do on turn v. 2 opp

[ybother]

What is your action on the turn???

villain is 50/0 over 28 hands
(yes I know flop cbet should be bigger...damn slider)

Ultimate Bet No-Limit Hold'em, $.50 BB (6 handed) Ultimate Bet Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

CO ($20.90)
Button ($7.45)
Hero ($64.65)
BB ($35.30)
UTG ($62.75)
MP ($48.30)

Preflop: Hero is SB with Q[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, Button calls $0.50, <font color="#CC3333">Hero raises to $2.5</font>, BB calls $2, UTG calls $2.50, Button calls $2.

Flop: ($10) 8[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets $5.5</font>, BB calls $5.50, UTG folds, Button calls $4.95 (All-In).

Turn: ($-27.05) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players, 1 all-in)</font>
<font color="#CC3333">Hero ????