Tough Turn Spot with 77: Did I Miss a Fold on the River?

$0.05/$0.10 NLHE (6-max) - Pocket Sevens (77)
Pre-Flop
Hero's position: MP (Middle Position)
Hero's hand: 7♦7♥
Action:
Hero raises to $0.30.
CO folds, BTN folds.
SB calls $0.25.
BB (Villan) calls $0.20.
Pot: $0.95

Flop: 8♥ 7♠ 5♠
Hero's hand: Set of sevens (7♦7♥)
Action:
SB checks.
BB checks.
Hero bets $0.60.
SB calls $0.60.
BB calls $0.60.
Pot: $2.75

Turn: 9♣
Board: 8♥ 7♠ 5♠ 9♣
Hero's hand: Set of sevens (7♦7♥)
Action:
SB checks.
BB bets $1.50.
Hero calls $1.50.
SB folds.
Pot: $6.75

River: 6♣
Board: 8♥ 7♠ 5♠ 9♣ 6♣
Hero's hand: Set of sevens (7♦7♥)
Action:
BB bets $4.50.
Hero calls $4.50.
Pot: $15.75

Results:
BB shows 6♠ 3♠ for a straight (9♣ 8♥ 7♠ 6♣ 5♠).
BB wins $15.

-With the 9♣ completing a lot of potential straight draws, should I consider raising the turn bet instead of calling?
-Should I have play for value against two-pair or focus on avoiding a straight in this scenario?
-This player was new they played fairly loose and was in alot of hands.