2/3 130 BB with KK

First HH post, sorry about bad formating.

Hero - young white male probably closer to TAG image won a big multiway pot by slowplaying nuts on a dry board and getting max value by convincing a player to commit his stack because i showed a bluff against him earlier.

villain - middle aged man, probably playing around 35/15. Was caught triple barrelling with 10q on ace k 10 x x board.

OTTH:

Villain is eff. stack with 130 BB

Folds to hero UTG + 2 with KsKd makes it 20 , villain calls in HJ, no other callers. Flop 6h 3d 3h. I lead out for 30 villain calls. Turn is Q spades and i bet 90 into around 105 i notice him hesistate for a bit then call. River is a non heart 9 and I check. He shoves all in for 225 into around 300. I stare at him and say "pocket 6's?" and notice him twitch his arm that's covering his cards.

Hero?