NL25 SH KK vs 2 opp call donk river

PartyGaming - $0.25 NL (6 max) - Holdem - 6 players
Hand converted by PokerTracker 3

Hero (MP): $25.00
CO: $26.10
BTN: $12.99
SB: $37.48
BB: $15.56
UTG: $63.04

SB posts SB $0.10, BB posts BB $0.25

Pre Flop: ($0.35) Hero has K♥ K♣

UTG raises to $0.75, Hero raises to $2.00, fold, fold, fold, BB calls $1.75, UTG calls $1.25

Flop: ($6.10, 3 players) 6♦ J♠ 7♠
BB checks, UTG checks, Hero bets $3.00, BB calls $3.00, UTG calls $3.00

Turn: ($15.10, 3 players) T♥
BB checks, UTG checks, Hero checks

River: ($15.10, 3 players) 5♣
BB bets $10.56 and is all-in, UTG calls $10.56, Hero calls $10.56

OK so BB it's a fish VPIP 53 PFR 17 AF 2 WTSD 25, UTG it's a regular quite a tight one and also passive in 267 hands has VPIP 19 PFR 12 AF 1 WTSD 18.So i 3bet pf and i would have gone all in vs UTG with my kings.On the flop i make a value bet.Now on the turn i stopped because i was foolishly been afraid of the UTG set mine call pf.Now on the river becuase of my non-combat on the turn i have a lot of question regarding their hands.I called because i was not afraid of the fish, i put UTG on QQ AJ, and also because no flush was there no straight.Now when i look at my play i think i should have played like that: Bet flop , Bet turn like 10 $, call any river bet ( i only have 10 $).