$25NL AA villain overbets river

[Sugar Nut]

<font color="blue">Villain runs 18/6/3 505 hands
Player Notes on villain: open minraises from MP2, calls 6bb raise oop, donks 6bb on T32r Flop, doesnt fold to raise </font>

PokerStars No-Limit Hold'em, $0.25 BB (9 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Hero ($27.60)
MP1 ($9.55)
MP2 ($11.75)
MP3 ($38.10)
CO ($15.15)
Button ($22.10)
SB ($30.85)
BB ($6.70)
UTG ($21.55)

Preflop: Hero is UTG+1 with A[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
UTG calls $0.25, <font color="#CC3333">Hero raises to $1.25</font>, <font color="#666666">5 folds</font>, SB calls $1.15, <font color="#666666">1 fold</font>, UTG folds.

Flop: ($3) 4[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets $1.5</font>, SB calls $1.50.

Turn: ($6) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets $3</font>, SB calls $3.

River: ($12) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $13.5</font>, Hero?

<font color="blue">I hate those spots, what am I gonna do here? Obviously 55 beats me and I don't think, he's loose enough to call 5bb in the SB with 95 or 53, he could have a busted Flushdraw, maybe even K[img]/images/graemlins/diamond.gif[/img]Q[img]/images/graemlins/diamond.gif[/img] for TPGK (note that I have the A[img]/images/graemlins/diamond.gif[/img]), or the straight with T[img]/images/graemlins/diamond.gif[/img]9[img]/images/graemlins/diamond.gif[/img] (unlikely also calling in the Sb), but wouldn't he have raised with those kind of hands along the way somewhere?
Is he bluffing here often enough that I can call profitably? </font>

Thanks for comments and/or discussions,

Sugar Nut