AA headsup on KK board.

[kbfc]

Hero raises A[img]/images/graemlins/spade.gif[/img]A[img]/images/graemlins/heart.gif[/img] UTG
SB (45/19, not particularly tricky postflop) 3bets.
Hero caps.
SB calls.

Flop is K[img]/images/graemlins/diamond.gif[/img]K[img]/images/graemlins/spade.gif[/img]8[img]/images/graemlins/diamond.gif[/img]
SB checks. Hero Bets. SB calls.

Turn is T[img]/images/graemlins/spade.gif[/img]
SB checks. Hero Bets.

Can someone make a case for checking on either the flop or turn?