NL2: KK facing draw or set or higher pair?

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PokerStars No-Limit Hold'em, $0.02 BB (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Button ($6.71)
SB ($3.65)
BB ($4.88)
UTG ($3.16)
Hero ($2.98)
MP1 ($2.95)
MP2 ($5.22)
CO ($2.19)

Preflop: Hero is UTG+1 with K[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/club.gif[/img].
UTG calls $0.02, <font color="#CC3333">Hero raises to $0.1</font>, <font color="#666666">1 fold</font>, MP2 calls $0.10, <font color="#666666">2 folds</font>, SB calls $0.09, <font color="#666666">1 fold</font>, UTG calls $0.08.

Flop: ($0.42) 6[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, UTG checks, <font color="#CC3333">Hero bets $0.26</font>, MP2 calls $0.26, SB folds, UTG folds.

Turn: ($0.94) A[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP2 bets $0.44</font>, Hero???

Can you put him on a hand? The Ace bit me, so i checked...
Maybe, when a scare card arrives its even better to bet out
and see whats happening. Harrington said in his first book
play your kings like aces, think i misplayed it a bit..

Whats your play?
Comments on other strees also appreciated!

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seems to be a really apparent hand...