Set OTR vs 2 Villains

BTN is 14/14 AF=10
CO is unknown

PF] Fine
F] Fine
T] Value bet as I think I'm still ahead though I'm struggling to put BTN on a range. FDs GS Overpairs 77 55 76s-32s. I think CO is coming along for the ride.
R] Shoving is just folding out worse hands so decide to c/f here.

888 Poker - $0.02 NL (6 max) FAST - Holdem - 6 players
Hand converted by PokerTracker 4

BTN: $2.06
SB: $2.08
BB: $2.14
UTG: $4.04
Hero (MP): $2.19
CO: $2.56

SB posts SB $0.01, BB posts BB $0.02

Pre Flop: (pot: $0.03) Hero has 3 3

UTG calls $0.02, Hero raises to $0.06, CO calls $0.06, BTN calls $0.06, fold, fold, UTG calls $0.04

Flop: ($0.27, 4 players) 7 3 5
UTG checks, Hero bets $0.20, fold, BTN calls $0.20, UTG calls $0.20

Turn: ($0.87, 3 players) 6
UTG checks, Hero bets $0.65, BTN calls $0.65, UTG calls $0.65

River: ($2.82, 3 players) 9
UTG checks, Hero checks, BTN??