20/40 99 value bet?

20/40 Borgata

Tight passive limps from mp, loose passive limps behind, I look down and see 9s9h from the button and raise; blinds fold, and limpers call

flop comes 7s 8d 3s

mp1 bets, mp2 calls, I raise, call, call

turn is 6s

checked to me, I bet, call, call

river is 6h

checked to me, I....?