AQ flops two pair, heavy action, questions on every street

[lightw1thoutheat]

this hand confused me quite a bit.
UTG+1 is 19/9.5
MP1 is 46/0
Party Poker 2/4 Hold'em (9 handed)
converter

Preflop: Hero is MP2 with A[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/heart.gif[/img]. CO posts a blind of $2.
<font color="#666666">1 fold</font>, <font color="#CC3333">UTG+1 raises</font>, MP1 calls, <font color="#CC3333">Hero 3-bets</font>, <font color="#666666">1 fold</font>, CO (poster) calls, <font color="#666666">3 folds</font>, UTG+1 calls, MP1 calls.

standard right?

Flop: (13.50 SB) 7[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
UTG+1 checks, <font color="#CC3333">MP1 bets</font>, <font color="#CC3333">Hero raises</font>, CO folds, UTG+1 calls, <font color="#CC3333">MP1 3-bets</font>, Hero calls, UTG+1 calls.

What to do here? i think i shouldve capped it

Turn: (11.25 BB) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
UTG+1 checks, <font color="#CC3333">MP1 bets</font>, <font color="#CC3333">Hero raises</font>, UTG+1 folds, <font color="#CC3333">MP1 3-bets</font>, Hero calls.
What do i do hear, still ahead of AK
River: (17.25 BB) Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">MP1 bets</font>, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">MP1 3-bets</font>, Hero calls

I'm almost certain that im not good here, MP1 has shown no aggression over 250 hands, so i figure that he has to have AA or 77. i figured was drawing dead or slim and got there.

help on all streets please
-light

Final Pot: 23.25 BB