CO has won every hand over 30 hands but has shown up with reasonably played holdings and seems thinking. SB has been loose fit or fold over 20 hands.

Stacks:
CO $2006
SB $344
Hero $643

plo600 5 handed

HJ folds, CO opens to $21, BTN folds, SB calls, Hero calls Qh Jh Jc 4c

Flop: Th 2h 3h

SB checks, Hero checks, CO bets $20, SB folds, Hero calls

Turn: Qd

Hero checks, CO pots ($103), Hero calls

River: 8h

Hero checks, CO pots ($309), Hero calls

Always calling here on anonymous sites? Does the removal of all the thin vbetting flushes here make it less of a call?