QQ caps and donk still likes to play

[Vern]

Villain is TAG, 22/11 PF and plays very aggressive post flop when he has a hand.

Poker Room skin
Limit Holdem Ring game
Limit: $0.25/$0.5
10 players
Converter

Pre-flop: (10 players) Hero is MP3 with J[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/diamond.gif[/img]
UTG calls, 3 folds, <font color="#cc0000">MP2 raises</font>, <font color="#cc0000">Hero 3-bets</font>, 4 folds, UTG calls, <font color="#cc0000">MP2 caps</font>, Hero calls, UTG calls.

Flop: 5[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/club.gif[/img] (13.6SB, 3 players)
UTG checks, <font color="#cc0000">MP2 bets</font>, <font color="#cc0000">Hero raises</font>, UTG folds, MP2 calls.

<font color="blue">I raised to protect my hand and to find out there I was, when he called, I figured he was on overcards and not an over pair.</font>

Turn: 3[img]/images/graemlins/heart.gif[/img] (8.8BB, 2 players)
MP2 checks, <font color="#cc0000">Hero bets</font>, MP2 calls.

River: Q[img]/images/graemlins/diamond.gif[/img] (10.8BB, 2 players)
MP2 checks, <font color="#cc0000">Hero bets</font>, <font color="#cc0000">MP2 raises</font>, Hero...

Ut oh, do I call here? Could he really have capped preflop with AQs or something? Am I wasting a bet calling here?