My Set brings a straight board, headsup

[rharless]

Suits are unimportant in this hand. Colorado $2-$5.

I am in the CO+1. The last two orbits I have raised preflop in LP and then folded on the flop.

There are three limpers to me in the CO+1 and I have pocket 99. I just call. Button calls behind me, blind checks. $12 / six players to the flop.

Flop: T 8 7

Check to me, I bet $5, the button calls and everyone else folds. By his facial expression, I feel I have the current best hand.

Turn: [T 8 7] 3

I bet, he now confidently raises. I call.

River: [T 8 7 3] 9

Your plan?