*grunch*

Preflop I'd fold. Given that everyone came along, and you hit the nut flush draw, bet the flop, or if you check intending to checkraise, might as well just coldcall once CO raises. On the turn I wouldn't 3-bet because you're probably losing to ace-better kicker. I guess the river might be a hold-your-nose-and-call but it could be a fold too. Probably if you just call the turn then MP2 comes along too and then the river is different.

BBB