AA in SB facing flop raise

[Flip_Dog]

PokerStars No-Limit Hold'em, $1.00 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

saw flop|<font color="#C00000">saw showdown</font>

<font color="#C00000">CO ($145.30)</font>
Button ($9.35)
<font color="#C00000">Hero ($100.95)</font>
BB ($81.30)
UTG ($113.25)
MP ($39.05)

Preflop: Hero is SB with A[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds</font>, CO calls $1, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $5</font>, <font color="#666666">1 fold</font>, CO calls $4.

Flop: ($11) 2[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $8</font>, <font color="#CC3333">CO raises to $21</font>, Hero calls $13.

Turn: ($53) 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">CO bets $34</font>, <font color="#CC3333">Hero raises to $74.95</font>, CO calls $40.95.

River: ($202.90) T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>

Final Pot: $202.90

villian is 28 15 over 50 hands haven't seen do anything special.