AJo UTG+1 Limp but then PFR'ed...now what?

[RED_RAIN]

Party Poker 0.50/1 Hold'em (9 handed)

Preflop: Hero is UTG+1 with A[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/spade.gif[/img].
UTG calls, Hero calls, MP1 folds, MP2 calls, <font color="CC3333">MP3 raises</font>, CO folds, Button folds, SB calls, BB calls, UTG calls, Hero calls, MP2 calls.

Flop: (12 SB) 7[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/spade.gif[/img] <font color="blue">(6 players)</font>
SB checks, BB checks, UTG checks, Hero checks, MP2 checks, <font color="CC3333">MP3 bets</font>, SB calls, BB folds, UTG folds, <font color="CC3333">Hero raises</font>, MP2 folds, MP3 calls, SB calls.

Turn: (9 BB) 7[img]/images/graemlins/club.gif[/img] <font color="blue">(3 players)</font>
SB checks, <font color="CC3333">Hero bets</font>, MP3 calls, SB folds.

River: (11 BB) 5[img]/images/graemlins/spade.gif[/img] <font color="blue">(2 players)</font>
<font color="CC3333">Hero bets</font>, MP3 calls.

Final Pot: 13 BB
<font color="green">Main Pot: 13 BB, between Hero and MP3.</font> &gt; <font color="white">Pot won by MP3 (13 BB).</font>

Results in white below: <font color="white">
Hero shows Ah Js (two pair, aces and sevens).
MP3 shows Kc Ac (two pair, aces and sevens).
Outcome: MP3 wins 13 BB. </font>

What is the correct play on the flop here and then out? He more than likely won't fold AK or AQ but should I fold this on the flop? Don't think so.