Did I play my AK correct on through when someone keeps betting into me

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Party Poker 1/2 Hold'em (9 handed)

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

Flop: (11.50 SB) 5[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/diamond.gif[/img] <font color="blue">(5 players)</font>
UTG checks, MP1 checks, <font color="CC3333">MP2 bets</font>, CO calls, <font color="CC3333">Hero raises</font>, UTG calls, MP1 folds, MP2 calls, CO calls.

Turn: (9.75 BB) A[img]/images/graemlins/club.gif[/img] <font color="blue">(4 players)</font>
UTG checks, <font color="CC3333">MP2 bets</font>, CO calls, <font color="CC3333">Hero raises</font>, UTG calls, MP2 calls, CO folds.

I wondered why he bet into me here, I thought about a set or maybe another 2 pair, so if he 3 bet I'd call down and if not I'd keep betting.

River: (16.75 BB) 5[img]/images/graemlins/spade.gif[/img] <font color="blue">(3 players)</font>
UTG checks, <font color="CC3333">MP2 bets</font>, Hero calls, UTG calls.

Meh I still should be in the lead.

Final Pot: 19.75 BB
<font color="green">Main Pot: 19.75 BB, between Hero, UTG and MP2.</font> &gt; <font color="white">Pot won by MP2 (19.75 BB).</font>

Results in white below: <font color="white">
UTG shows Kd 9c (two pair, kings and fives).
MP2 shows 3s 3h (full house, threes full of fives).
Hero shows Ks Ad (two pair, aces and kings).
Outcome: MP2 wins 19.75 BB. </font>