NL2: Rivered low Flush

Hand converted with online PokerStrategy.com hand converter:

Hand abspielen

$0.01/$0.02 No-Limit Hold'em (6 handed)

Known players:
[tg]BB (Hero)$2.00:///////;MP2$1.74:///////;MP3$1.44:///////;CO$2.00:///////;BU$2.00:///////;SB$0.84:///////;[/tg]

Preflop: Hero is BB with 4:s, 5:s.
MP2 calls $0.02, MP3 calls $0.02, CO calls $0.02, BU folds, SB calls $0.01, Hero checks.

Flop: ($0.1) 4:h, J:s, 6:s (5 players)
SB checks, Hero checks, MP2 checks, MP3 checks, CO checks.

Turn: ($0.1) T:h (5 players)
SB checks, Hero checks, MP2 checks, MP3 checks, CO checks.

River: ($0.1) K:s (5 players)
SB checks, Hero bets $0.07, MP2 raises to $0.14, MP3 folds, CO calls $0.14, SB folds, Hero raises to $0.42, MP2 calls $0.28, CO calls $0.28.

Final Pot: $1.36.

Bin mir hier null sicher was die richtige Spielweise am River ist. Soll ich seinen Raise nur callen wegen der Gefahr eines höheren Flushs oder ist der Raise ok, weil er hier auch den King so spielt??