How to play KK vs preflop aggression when an ace falls?

[Niediam]

Hypothetical situation. Say Villian is 20/8.

You raise in EP with K [img]/images/graemlins/diamond.gif[/img]K [img]/images/graemlins/heart.gif[/img]. Villian three bets and you cap.

Flop is A [img]/images/graemlins/spade.gif[/img]7 [img]/images/graemlins/heart.gif[/img]2 [img]/images/graemlins/club.gif[/img].

What is the general game plan if you bet out and villian calls?