[jessicafk]

Fold. With a big hand, say AA, CO will not simply limp in a 6-max game with limpers in front of him. Highly unlikely that this player slow played AA, which is the only hand that you can beat here. His starting hand is highly speculative and he likely flopped the joint after getting in cheaply. A set will not check raise the turn after check raising the flop. A set will lead out on the turn hoping you caught a King. You are up against a made hand here of 54 suited, not a set. You have folding equity here, so fold.