QQ scared of AA

[parttimepro]

1/2 NL, $200 max. Villain and I both have $200.
I get black QQ on the button. Folds to me, and I raise to $7. SB folds, and Villain raises to $12 from the BB. I think about it for a little and call. Obviously I won't fold, but this might be a raising situation. I decided raising wouldn't tell me anything because AA and KK might just call, so if I raise and get called, I can't rule out those hands.

Flop is all undercards with 2 hearts. BB checks. The pot is $25, and I bet $25, hoping to fold out AK. BB calls.

Turn is another undercard, not a heart. By now I'm pretty sure villian has a bigger overpair. He checks, and I check behind.

River is the K[img]/images/graemlins/diamond.gif[/img]. Villian bets $75. Pretty easy fold? It's hard to think of a hand he would play that way that I would beat. I put him on AA, KK, AK. JJ and TT would be unlikely to reraise preflop, and in any case would probably put me on some kind of overpair or AK, so couldn't expect to be ahead or fold me out.

Anybody bet the turn? If the river were a blank, would you be more likely to call a pot-sized bet?