100NL AK KT9 Facing donkbet

[Pieter86]

Party Poker - No Limit Hold'em Cash Game - $0.50/$1 Blinds - 6 Players - (LegoPoker Hand History Converter)

SB: $20.88
BB: $48.00
UTG: $105.54
MP: $48.23
Hero (CO): $131.90
BTN: $87.43

Preflop: Hero is dealt A[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/club.gif[/img] (6 Players)
<font color="red">UTG raises to $2.00</font>, MP calls $2.00, <font color="red">Hero raises to $10.00</font>, 3 folds, UTG calls $8.00, MP folds

Flop: ($23.50) K[img]/images/graemlins/heart.gif[/img] T[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">UTG bets $18.00</font>, Hero ?

Hi there, I have been reading the forums for a while and I decided it is time to start posting some [img]/images/graemlins/smile.gif[/img]
I figured the best way to introduce myselve is posting a hand, it is probably a standard situation but those donkbets really confuse me.

What would you guys do here? If we raise we aint folding anymore right?
And if we call what do we do on the turn when checked to or bet to?

Villain is 35/12 but only over 30 hands or something...