CO: 46/18 (99 hands)
Preflop standard 3bet - I don't have calling range here.
Flop is good for us I think small sizing and 60% is ok. For a raise my hand is too strong to fold and his range consist of many overcards that he can bluff some T pairs but with a raise I think all of his T beats me, JJ, flush draws, and set of 66. I would call it merged range (new word in my vocabulary)
Turn: For that sizing I am not thinking about folding. I think his range still same but without air overcards.
River: Sizing really says that he has some of T or JJ that he thin valuebets or busted flushdraw. Overall this line seems to be little underbluffed specially with flop raise.
What do you think fold or call?

PokerStars - $0.05 NL (6 max) - Holdem - 5 players

BB: 122 BB
UTG: 82.2 BB
CO: 109.8 BB
BTN: 115 BB
Hero (SB): 112.6 BB

Hero posts SB 0.4 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.4 BB) Hero has Qh Th
fold, CO raises to 3 BB, fold, Hero raises to 11 BB, fold, CO calls 8 BB

Flop : (23 BB, 2 players) Ts 4d 6d
Hero bets 6.6 BB, CO raises to 14.2 BB, Hero calls 7.6 BB

Turn : (51.4 BB, 2 players) 8h
Hero checks, CO bets 14 BB, Hero calls 14 BB

River : (79.4 BB, 2 players) 5h
Hero checks, CO bets 24.2 BB, ???