meh small overpair

No reads on villain, he bought in in full and his timing was quick on his turn bet. He didn't quick bet the river but he didn't think about it for that long either.

PokerStars No-Limit Hold'em, $0.50 BB (5 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button ($13.35)
SB ($76.10)
BB ($51.90)
UTG ($80.55)
Hero ($48)

Preflop: Hero is MP with T, T.
1 fold, Hero raises to $2, 2 folds, BB calls $1.50.

Flop: ($4.25) 9, 9, 6 (2 players)
BB checks, Hero bets $3.5, BB calls $3.50.

Turn: ($11.25) 7 (2 players)
BB bets $8, Hero calls $8.

River: ($27.25) 6 (2 players)
BB bets $20 Villain has ~18 left.
Hero...

I probably call if I have taken the hand this far, but I'm a POW.
Alternately, I raise turn to $24 and fold to a push. If called check behind river.
Caveat: I'm a tagfish.

he played 89 well!

Is this clearly a 9?

I'd most likely dump it on the turn here.. his line reeks of strength. You're not really beating anything either.