Check-call Quads Kings on Turn&River?

[robokop]

Opponents are both loose preflop, and weak post-flop. Neither has a particularily high went to showdown percentage (about 32% each).

Party Poker 5/10 Hold'em (6 max, 5 handed) converter

Preflop: Hero is BB with 6[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/spade.gif[/img].
<font color="#666666">1 fold</font>, MP calls, Button calls, <font color="#666666">1 fold</font>, Hero checks.

Flop: (3.40 SB) 4[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, MP calls, Button calls.

Turn: (3.20 BB) K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, MP checks, <font color="#CC3333">Button bets</font>, Hero calls, MP calls.

River: (6.20 BB) 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks... (With the intention of calling should Button bet, and raising if MP bet, since then I'm last to act...)

I figured if I bet the turn they would get scared. And once Button bet the turn, I figured the best way to get the most into the pot was to check-call both the turn and the river. (Leading the river also seems likely to scare weak players.)

How'd I do?