AA facing aggression on coordinated lowcard board vs TAG

[ReadOnYou]

23.9vp 15.6pfr 1.5af 14 wts


Party Poker, $0.50/$1 NL Hold'em Cash Game, 5 Players
LeggoPoker.com - Hand History Converter

CO: $167.97
BTN: $104
SB: $164.38
BB: $284.25
Hero (UTG): $126.59

Pre-Flop: A[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/spade.gif[/img] dealt to Hero (UTG)
<font color="red">Hero raises to $4</font>, 2 folds, SB calls $3.50, BB folds

Flop: ($9) 7[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $7</font>, <font color="red">SB raises to $21</font>, Hero calls $14

Turn: ($51) 6[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">SB bets $25</font>, Hero ???