KK vs a loose player 30/60

[Mig]

Ok that's the kind of hand I have a hard time dealing with. I'm wondering if when you have a doubt, do you back up and just call down ?

I have K [img]/images/graemlins/club.gif[/img]K [img]/images/graemlins/heart.gif[/img] UTG. I raise. Loose/Agg player (30%VPIP/15% pfr) reraise on the button. It's my second orbit and never played vs him so I don't have much of a read there. 30/60 PP full ring. I cap.


The flop is:
[ 2[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/spade.gif[/img], 6 [img]/images/graemlins/spade.gif[/img] ]
I bet, he raises, I 3 bet and he caps.
Now, most agressive players like him would do the same with AKs/QQ/AA ....

The turn is a 6 [img]/images/graemlins/heart.gif[/img]
I donk...

How far am I willing to go ? I don't want to give a free card to JJ/QQ and flush draw and at the same time, I don't want to payoff AA... Should I just call down from here to anymore agression ?

I feel it's horribly standard. Thanks for any feedback.