KK faces an Ace on the flop

[LowDown22]

Was unsure what the correct play was in this situation.

Been at the table for a short while. My only read on EP is that he seems better than the average Party player, but still will call with stuff like KTo, 78s, etc. from any position. He and two others at the table think I am a LAG and have been chatting about it.

Party $.50/1 10 handed.
I am dealt K [img]/images/graemlins/club.gif[/img]K [img]/images/graemlins/spade.gif[/img] in late MP.

2 folds, EP calls, 2 folds, I raise, 3 folds, BB calls, EP calls.

3 to the flop for 6.5 SBs.
Flop is A [img]/images/graemlins/club.gif[/img]9 [img]/images/graemlins/heart.gif[/img]8 [img]/images/graemlins/spade.gif[/img].
BB checks, EP bets, I raise, BB folds, EP calls.

2 to the turn for 5.25 BBs.
Turn is 7 [img]/images/graemlins/diamond.gif[/img]
EP bets, I ....???

I figure there's two possible plays here. Either I fold now and give him credit for an Ace or something that beats me. Or I call down turn and river.

How would you play it from here?

EditThe turn card was 7 not 3)