No reads other than villian wanted bigger pots and more action

PokerStars No-Limit Hold'em, $1.00 BB (6 handed) FTR converter on zerodivide.cx

Button ($55.85)
SB ($100)
BB ($66.45)
UTG ($21.35)
MP ($89.40)
Hero ($100.50)

Preflop: Hero is CO with 6, 6.
1 fold, MP calls $1, Hero calls $1, Button calls $1, SB completes, BB checks.

Flop: ($5) 5, 7, 6 (5 players)
SB checks, BB checks, MP checks, Hero bets $2, Button folds, SB folds, BB calls $2, MP folds.

Turn: ($9) 4 (2 players)
BB bets $7, Hero ???