3/6 AKs vs. Nit

[Harv72b]

Villain is 12/10/6 over a 250-ish sample. I have no notes on him which just means that he hasn't done anything noteworthy.

Hero has been at the table for about 4 orbits & has looked very LAG preflop during that time. Partly because of a donator two seats to his right, party because he's had some good starting hands, and partly because that's just the way Hero was made. Postflop, however, Hero has been on his best behavior--the table knows I'll c-bet the flop, but I haven't gotten unruly in any other way (that they know of).

Full Tilt 3/6 Hold'em (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is MP3 with A[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">3 folds</font>, <font color="#CC3333">BB 3-bets</font>, <font color="#CC3333">Hero caps</font>, BB calls.

Flop: (11.50 SB) J[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets</font>, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">BB 3-bets</font>, Hero calls.

Turn: (9.25 BB) K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, Hero...?

What action to take here is the secondary question. What I'm mainly curious about is, what does BB have &amp; why do you think that?