25NL, 99 gets 3bet, flops overpair

[Tomke]

Villain is 38/11/1.5 over 70 hands, kinda lost in this hand. Bet the flop and shutdown when called/raised? Turn call was a mixture of peeling/drawing to my gutshot/set, how do you like it? What do I do on the river?

Seat 1: BB ($24.05)
Seat 2: Hero ($23.85)
Seat 4: CO ($36.51)
Seat 5: BUTTON ($47.89)
Seat 6: SB ($46.70)
SB posts the small blind of $0.15
BB posts the big blind of $0.25
The button is in seat #5
*** HOLE CARDS ***
Dealt to Hero 9 9
Hero raises to $1.00
CO folds
BUTTON folds
SB folds
BB raises to $2.65
Hero calls $1.65
*** FLOP *** 6 2 5 (pot = $5.45)
BB checks
Hero checks
*** TURN *** 6 2 5 7 (pot = $5.45)
BB bets $2.75
Hero calls $2.75
*** RIVER *** 6 2 5 7 5 (pot = $11)
BB bets $5.55
Hero ???