NL100SH, Squeeze with ATs gets called, flop comes 9T2 rainbow

[skibbel]

PokerStars No-Limit Hold'em, $1.00 BB (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

UTG ($101.50)
MP ($19.50)
Button ($47.20)
SB ($110.25)
Hero ($100)

Preflop: Hero is BB with A[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">UTG raises to $4</font>, MP calls $4, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $20</font>, UTG calls $16, MP folds.

Flop: ($44.50) 9[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $31</font>

Villian unkown, Shorty typical loose donk. Once i raise preflop, i guess i have to bet that flop? Do i stack off to a push?