NL50: AK hits top pair - can you find a fold?

[guess who]

Hi there,

villian is a 23/7/3.

Party Poker
No Limit Holdem Ring game
Blinds: $0.25/$0.50
5 players
Converter

Stack sizes:
UTG: $76.30
CO: $56.96
Button: $127.75
Hero: $77.95
BB: $40.75

Pre-flop: (5 players) Hero is SB with K[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/diamond.gif[/img]
UTG folds, CO calls, Button folds, <font color="#cc0000">Hero raises to $2.5</font>, BB calls, CO calls.

Flop: K[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] ($7.5, 3 players)
<font color="#cc0000">Hero bets $7</font>, BB folds, <font color="#cc0000">CO raises to $18</font>, Hero calls.

Turn: 2[img]/images/graemlins/spade.gif[/img] ($43.5, 2 players)
Hero checks, <font color="#cc0000">CO bets $20.5</font>, Hero folds?!

What do I beat here except a bluff? In my opinion this is KQ/JT a lot... what do you think about this hand?

ty guess