One of those hands i guess

You limp A8o(no hearts) from the SB, after CO has just called the bb(his VPIP is like 70 or something). He is very passive overall, but will bet any two if a flop comes checked to him 3-handed.

Thus, BB checks, flop comes down KK2 (2 hearts).

The pot is just 3SB, it goes check/check to the CO, who bets.

Fold or checkraise(and leading any turn, making that the last bet you put in UI *sidenote CO will never bluff a river*)