KK when Ace hits the turn

[mrwatson23]

I don't really like how I played this hand. I didn't want to give a free card on the turn in case MP1 had a flush draw, plus, he seemed like a typical Party player, so I thought there was a good chance he would have raised with a decent Ace pre-flop. Should I have bet and then folded to a raise? The only thing that worries me about that is that the Ace is such a good bluff/scare card, that he could be making a move at the pot with a draw. Check folding seems very weak. What should I have done?

Party Poker 20/40 Hold'em (8 handed) converter

Preflop: Hero is BB with K[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, UTG+1 calls, MP1 calls, MP2 calls, <font color="#666666">2 folds</font>, SB completes, <font color="#CC3333">Hero raises</font>, UTG+1 calls, MP1 calls, MP2 calls, SB calls.

Flop: (10 SB) 3[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, UTG+1 folds, MP1 calls, MP2 folds, SB folds.

Turn: (6 BB) A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP1 raises</font>, Hero calls.

River: (10 BB) 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP1 bets</font>, Hero calls.

Final Pot: 12 BB

Results in white below: <font color="#FFFFFF">
Hero has Kh Kd (one pair, kings).
MP1 has 5s As (one pair, aces).
Outcome: MP1 wins 12 BB. </font>