Opener is 22/17ish. No reads on cold caller. We're all sorta deep

Full Tilt No-Limit Hold'em, $0.50 BB (6 handed) Converter Tool from (Format: Bet The Pot)

CO ($74.70)
Hero ($90.20)
SB ($94.25)
BB ($50)
UTG ($54.55)
MP ($17.30)

Preflop: Hero is Button with , .
2 folds, CO raises to $2, Hero raises to $6.75, SB calls $6.50, 1 fold, CO calls $4.75.

Flop: ($20.75) , , (3 players)
SB checks, CO checks, Hero bets ??