Check-raising a 2+2er with quads

[Nightwish]

The villain in this hand is a known 2+2er. His stats are 23.68/17.29/1.72 over 2,424 hands. The game is Party 30/60, it's being played 9-handed, and the CO is posting the BB for his first hand.

UTG limps, 2+2er limps in UTG+1, MP1 folds, MP2 calls, MP3 folds, CO checks, button folds, I complete with K[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/spade.gif[/img], and BB checks.

Flop (6 players, 6 SB): K[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/club.gif[/img]

I check, it's checked around to the 2+2er who bets, the two people behind him fold, I call, and the other two guys fold as well.

Turn (2 players, 4 BB): 9[img]/images/graemlins/spade.gif[/img]

I bet, 2+2er calls.

River (2 players, 6 BB): K[img]/images/graemlins/diamond.gif[/img]

I check with the intention of check-raising....

Comments on all streets appreciated.