2/4 B&M - turn play with 99 and 4 card flush draw; counting outs?

[Hyperrrprank]

I think a peel is fine on the flop. The 2 outs to trips are squeaky clean, and while the BDFD is a weak one, the 9 doesn't need to be good very often to add the very small amount of value you need.

I think you do need to be on the ball if and when the flush comes in, any mistakes at that stage erase your value in call.