100NL - KQs raised pot - flop NFD on A high board

[S.Clause]

This was 100NL at Everest (couldn't get the handconverter to work)

No particular reads, but haven't seen the villan go out of line during the short time I was at the table.

MP ($120.30)
CO ($102.15)
BUTTON ($98.50)
SB ($41.75)
Hero ($100.35)
UTG ($252.65)

*** HOLE CARDS ***
Dealt to Hero[Q[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/club.gif[/img]]
fold, fold
CO raises to $3.50
folded to Hero
Hero calls $2.50
*** FLOP *** [6[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/club.gif[/img]]
Hero bets $6.00
CO calls $6.00
*** TURN *** [6[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/club.gif[/img]] [K[img]/images/graemlins/heart.gif[/img]]
Hero bets $15.00
CO calls $15.00
*** RIVER *** [6[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/heart.gif[/img]] [K[img]/images/graemlins/diamond.gif[/img]]
Hero ?

I put him on a stubborn/maybe weak ace or a FD. I would expect pocket sixes, deuces and AK to be reraising flop if not turn. What's the best line here?

thanks in advance!