Nut Flush + OE Straight Draw Turn Play

[TheRempel]

PokerStars Pot-Limit Omaha High, $1.00 BB (8 handed) converter

UTG+1 ($33.40)
Hero ($97.50)
MP2 ($58)
CO ($55.45)
Button ($143.85)
SB ($67.35)
BB ($122.40)
UTG ($11.15)

Preflop: Hero is MP1 with A[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">UTG raises to $3.5</font>, <font color="#666666">1 fold</font>, Hero calls $3.50, MP2 calls $3.50, <font color="#666666">1 fold</font>, Button calls $3.50, SB calls $3, BB calls $2.50.

Flop: ($21) Q[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(6 players)</font>
SB checks, BB checks, <font color="#CC3333">UTG bets $7.65 (All-In)</font>, Hero calls $7.65, MP2 folds, <font color="#CC3333">Button raises to $24</font>, SB folds, BB calls $24, Hero calls $16.35.

Turn: ($100.65) 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players, 1 all-in)</font>
BB checks, Hero ?

Certainly a case for raising the flop. I wanted to see what the button's action was before I went crazy on reraising.

With no real read on the button on the turn, what do you do?