2/5 NL Foxwoods: Middle Set With Possible Straight/ Flush Draw On Flop

[TheDaubfather]

2/5 NL Foxwoods

I have been at the table 1 hr and have been playing very tight. I am in the CO with 5 [img]/images/graemlins/spade.gif[/img]5 [img]/images/graemlins/heart.gif[/img] and $450. 2 limpers in front of me, I limp, button raises to $25. Everyone calls including SB and BB. Pot is $150

Flop
A [img]/images/graemlins/spade.gif[/img]3 [img]/images/graemlins/heart.gif[/img]5 [img]/images/graemlins/spade.gif[/img]

Everyone checks to me, I bet $100, Button Calls, SB shoves and has me covered. BB folds, 2 others fold. Action with me with button still to act.

1.) Should I have bet the flop different?
2.) Is this an insta-call even with a player behind me?

Thanks.

[Trader_Joe]

What could you do? Muck your hand?

Insta-call. I know there will be good pot odds for button to call if he is on flush draw.