Nut flush, on paired board, what do you do?

[Hartlin]

What do you do here..?

PokerStars No-Limit Hold'em, $0.25 BB (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG ($8.35)
MP ($63.70)
Button ($53.50)
SB ($29.50)
Hero ($24.65)

Preflop: Hero is BB with 2, A.
1 fold, MP calls $0.25, 1 fold, SB completes, Hero checks.

Flop: ($0.75) 5, K, K (3 players)
SB checks, Hero bets $0.5, MP calls $0.50, SB folds.

Turn: ($1.75) 9 (2 players)
Hero checks, MP bets $1, Hero raises to $3, MP calls $2.

River: ($7.75) 7 (2 players)
Hero bets $5, MP raises to $15

[BobbySalami]

This is just me, might be wrong, but I think i call here and pay off 55 if he has it....You are being offered ~2:1 odds here, and I believe you are up against a guy slowplaying a King here 33% of the time....

A read here would be very helpful to know what to do...

EDIT: Whoops, just noticed it was shorthanded.....my advice may be terribly off due to this reason.

[Hartlin]

This is like the 5th hand of the game, notice I've lost my BB and my SB only hehe, so I have no reads at all

[zook]

Push.

[knoedel]

I'd just call, no need to payoff boat for my whole stack. My problem here: He knows you have/are representing the flush because of the c/r on the turn. This makes me worry a bit. If you are lucky he only has an underflush or he is a total moron slowplaying a king on a flushboard.

[Hartlin]

I'll wait for some more replies before I say what I did.