AA on super dry board 3 way with lots of action

[Teh1337zor]

MP has taggish stats but I don't think hes very good and have seen him get out of line trying to make some hopeless bluffs
CO is a good tag

6 handed, 2/4 nl
Stacks:
Hero:$900
MP:$400
CO:550
Hero is UTG and raises A [img]/images/graemlins/club.gif[/img]A [img]/images/graemlins/spade.gif[/img] to $14
MP calls
CO calls
3 folds

Flop(pot:$48, 3 players): 9[img]/images/graemlins/diamond.gif[/img]2 [img]/images/graemlins/club.gif[/img]5 [img]/images/graemlins/heart.gif[/img]

Hero bets $38
MP raises to $95
CO makes it $220

I just dont see why somebody would play a set so fast here