CO is a 17/15 Tag that doesn't seem to like to fold. UTG is a 38/0 calling station. I didn't want to blow the fish out on the flop, and he hadn't folded a flop yet so I decided to call the flop.

PokerStars No-Limit Hold'em, $2 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP ($124.50)
CO ($289.65)
Hero ($468.45)
SB ($332.30)
BB ($49.95)
UTG ($123.70)

Preflop: Hero is Button with 8, 6.
UTG calls $2, 1 fold, CO raises to $8, Hero calls $8, 2 folds, UTG calls $6.

Flop: ($27) T, 9, 9 (3 players)
UTG checks, CO bets $18, Hero calls $18, UTG folds.

Turn: ($63) 7 (2 players)
CO checks, Hero ???

If you are betting how much? If you are checking why?