K9s ipo multi pot

PokerStars - $0.25 NL (6 max) - Holdem - 5 players
Hand converted by PokerTracker 3

SB: $22.15
BB: $25.57
UTG: $15.28
Hero (CO): $25.73
BTN: $27.77

SB posts SB $0.10, BB posts BB $0.25

Pre Flop: ($0.35) Hero has K♥ 9♥

fold, Hero raises to $0.75, fold, SB calls $0.65, BB calls $0.50

Flop: ($2.25, 3 players) T♦ Q♥ K♠
SB checks, BB checks, Hero bets $1.50, SB calls $1.50, fold

Turn: ($5.25, 2 players) 6♥
SB checks, Hero checks

River: ($5.25, 2 players) 5♥
SB bets $3.75, Hero raises to $11.25, SB calls $7.50

Villains are unknown they all look regish.
Should i bet turn for protection or ch/ behind is better?
I hate to get ch/ raised or shoved and not a lot cards scare me on river so i give free card on turn is that good or bad ?