Another hand against the VERY Tricky LAG

[nepenthe]

Same table, same guy (LP) as in my previous post. I get a KK in UTG and open-raise. Folded to the LP who 3-bets. Folded to me and I cap. It's heads-up. Table was getting bad so I left soon after this hand.

Flop: Q Q x (suit unimportant)

OK, he either has the Q or he doesn't. I do something I have never done in this situation HU. I check. LAG LP bets. I call.

Turn: another offsuit rag.

I check and call.

River: another rag. I bet.

I regretted not check-raising the turn btw. Comments?