25NL KK 3way when flush hits on turn

Hand converted with online PokerStrategy.com hand converter:

Play hand

$0.1/$0.25 No-Limit Hold'em (6 handed)

Known players:
[tg]BU$34.56:///////;SB$39.09:///////;BB$8.57:///////;MP2 (Hero)$33.02:///////;MP3$25.85:///////;CO$11.61:///////;[/tg]

Preflop: Hero is MP2 with K:s, K:c.
Hero raises to $0.75, MP3 calls $0.75, 3 folds, BB calls $0.50.

Flop: ($2.35) 2:h, 2:c, 8:h (3 players)
BB checks, Hero bets $1.49, MP3 calls $1.49, BB calls $1.49.

Turn: ($6.82) 4:h (3 players)
BB checks, Hero checks, MP3 checks.

River: ($6.82) 5:c (3 players)
BB checks, Hero bets $6.50, MP3 raises to $23.61, BB folds, Hero folds, MP3 gets uncalled bet back.

Final Pot: $13.32.

Should I b/f turn or only when heads-up?
I bet river because the fish might call with worse and is unlikely to have a flush, when reg raises I have to fold.