A situation where I'm not as sure as I thought...

[deception5]

This type of hand came up twice this weekend and I thought it was an easy 3-bet at the time but now I'm reconsidering. This happened 5/10 6-max once and 2/4 full once and the answers may very well be different for the 2 limits.

I am dealt A [img]/images/graemlins/club.gif[/img]A [img]/images/graemlins/diamond.gif[/img]. I raise and get one cold caller.

Flop is 9 [img]/images/graemlins/club.gif[/img]8 [img]/images/graemlins/club.gif[/img]2 [img]/images/graemlins/heart.gif[/img]. Bet, call.

Turn is 4 [img]/images/graemlins/club.gif[/img]. Bet, raise. Against an unknown do you tend to 3-bet or just call down here? Against a tag?

Last question - if this is a K [img]/images/graemlins/club.gif[/img] it's an easy 3-bet, right?

Thanks for the help!