TPTK w nut flush draw on flop

No-Limit Hold'em, $ BB (8 handed)

The flops had been missing me and I jumped at this. I feel it was wrong but I'd be interested to hear why. Let me have it!

MP1 is 56/14/2.3 over 55 hands
MP2 is 32/2.5/1.25 over 122 hands
Hero is on button w A [img]/images/graemlins/club.gif[/img] Q [img]/images/graemlins/spade.gif[/img]

SB ( $62.73 )
BB ( $14.46 )
EP1 ( $29.10 )
EP2 ( $31.29 )
MP1 ( $134.51 )
MP2 ( $24.85 )
CO ( $13.21 )
BUTTON ( $27.30 )

SB posts $0.25, BB posts $0.50, 1 fold, EP2 limps, MP1 raises to $1.50, 2 calls, hero calls, SB calls, BB folds, EP2 calls

Flop: ($9.50) 9 [img]/images/graemlins/club.gif[/img] Q [img]/images/graemlins/club.gif[/img] 8 [img]/images/graemlins/club.gif[/img]
2 checks, MP1 bet $5, MP2 calls, 1 fold, hero raises to $15, 2 folds, MP1 raises all-in, 1 fold, hero calls last $10.80.

Calling all-in was automatic with pot odds of 5:1, but what do you think of the raise to $15?