AA in BB goes bad

[AliasMrJones]

Pacific 30+3 so no converter

Blinds at 25/50

Important stacks:

MP2 1,011
Button 1,432
AliasMrJones (BB) 1,475

AliasMrJones is dealt A[img]/images/graemlins/heart.gif[/img]A[img]/images/graemlins/club.gif[/img]

Folded to MP2 who limps, Button raises to 100, AliasMrJones calls, MP2 calls.

Not my typical play, but the blinds go up fast in this tourney and I wanted to try to check/raise flop.

Flop is 3[img]/images/graemlins/heart.gif[/img]2[img]/images/graemlins/heart.gif[/img]2[img]/images/graemlins/club.gif[/img]

I've seen MP2 play some junky cards, but haven't heard much from button. I check, MP2 checks, Button bets 150, I raise to 400, MP2 calls, button calls.

Turn is 9[img]/images/graemlins/heart.gif[/img]

I check (mistake?), MP2 wakes up and bets 495, saving 16 for who knows what, Button folds. I think for most of my 45 seconds and...

What should I do here? Could MP2 have a 2? Flush? I'm behind both of those possibilities. A 3 or a 9? Hard to believe he'd call the check-raise 400 with nothing.

Comments on play so far and what my move should be appreciated.