Set versus a nightmare board - 99

[StellarWind]

5/10 6-max (6-handed)

Hero is Button with 99.

UTG and Cutoff limp, Hero raises, BB and limpers call.

Flop is QJ9 3-suited. Hero bets and only Cutoff calls. Cutoff is probably LAG but beyond that we don't know him. Heads up to the turn for 5 BB.

Turn is an offsuit four. Hero bets and Cutoff calls. 7 BB to the river.

River is an off ten. Cutoff checks and Hero bets ...