Standard calldown? Or should I raise the flop?

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $1/$2
5 players
Converter

Stack sizes:
UTG: $197
Hero: $257.15
Button: $288.15
SB: $94.65
BB: $44.75

Pre-flop: (5 players) Hero is CO with 6 6
UTG folds, Hero calls, Button folds, SB calls, BB checks.

Flop: 8 8 8 ($6, 3 players)
SB bets $6, BB folds, Hero calls.

Turn: 3 ($18, 2 players)
SB bets $12, Hero calls.

River: 9 ($42, 2 players)
SB bets $44, Hero calls.

Results:
Final pot: $130
Hero showed 6c 6s
SB showed Ks 7s