More KK Trouble - Bet this Postflop?

[Cleveland Guy]

$5 Pokeroom Turbo.

Blinds moving every 3 minutes. About 65 Left, top 40 Pay.

Hero is in top 15 with 15,000 Chips.

Current blinds are 400/800.

Hero Gets KK - UTG and checks to check raise or check call, as it's been agressive with the blind stucture.

3 others Limp behind, including 2 other top 15 stacks.

Flop comes AAT - No suits.

BB Checks, what's my play?