PF Question - SB coldcall

[StellarWind]

Paradise 2/4. Two loose players limp from EP and MP. TAG raises from the Button. You have A9s. Big blind is fairly selective but I wouldn't call him tight.

Do you play this?

I called, flopped a flush, and called a lot of raises before they worked out who really had the nuts. That was fun but now I am looking for some more objective feedback.

[Homer]

I would fold, as I don't feel that 5:1 is enough. You are primarily playing to flop a flush draw (7.5:1), as your Ace can easily be dominated by the preflop raiser. If I knew that the preflop raiser would only raise after limpers with a big pocket pair, then I would call, as in that case flopping an Ace would be good often enough to make playing the hand profitable.