SB is big fish, CO is unknown. I think he is able to raise flush draw and maybe some overpair.
Hand converted with online PokerStrategy.com hand converter:
$0.1/$0.25 No-Limit Hold'em (6 handed)
Known players:
[tg]MP3 (Hero)$25.00:///////;CO$25.00:///////;BU$43.43:///////;SB$20.22:///////;BB$41.03:///////;MP2$29.73:///////;[/tg]
Preflop: Hero is MP3 with K:d, K:h.
MP2 folds, Hero raises to $1.00, CO calls $1.00, BU folds, SB calls $0.90, BB folds.
Flop: ($3.25) 3:c, 6:h, 2:c (3 players)
SB bets $1.50, Hero raises to $4.50, CO raises to $24.00(All-In), SB folds, Hero calls $19.50(All-In).
Turn: ($52.75) J:s (2 players)
River: ($52.75) 6:d (2 players)
Final Pot: $52.75.