At a live $1-2 game (max $100 buy-in). Table is 10 handed Hero is BB with $125 and gets dealt Kc9c. Table is fairly passive. MP1, MP3 limps, CO limps, SB completes Hero checks. $7 pot after rake and the flop comes Ac8s3c checked to MP1 who bets $6, MP3 folds, CO pushes all in for $75, SB folds. MP1 is almost sure to fold based on his previous play and the smallish bet. CO has been tight in the 3 or so rounds I have been at the table laying down most hands and not showing any real agression before this hand. I feel like I am WAWB on this hand. Maybe 20% set, top two pair; 60% flush draw, 20% bluff. The problem comes with the flush draw and bluff hands that he has caught middle/bottom pair as well.

What is your experience in this situation? Do you call $75 with the nut flush draw into a $90 pot? Obviously, if the pot is $150 this is an instant call so where is the tipping point on this kind of move in a live game? What do you usually see villain show down with this move.