$50 nl AA facing big flop re-raise

[betheball]

Small Blind is 20/10/3 over 150 hands. His stats are a little misleading because he folded his first 20 hands or so, then played more aggressively since. He's straight forward & not a bad player.

I'm playing 28/16/3.5, TAG in early position & LAGish in late position & in the blinds. I'm also taking a lot of stabs at flops & then laying down to re-raises without hands/draws.

Full Tilt No-Limit Hold'em, $0.50 BB (6 handed) Full Tilt Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

BB ($59.90)
UTG ($50)
MP ($10)
Hero ($167.85)
Button ($60.85)
SB ($89.05)

Preflop: Hero is CO with A[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $1.75</font>, <font color="#666666">1 fold</font>, SB calls $1.50, <font color="#666666">1 fold</font>.

Flop: ($4) 4[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $3.5</font>, <font color="#CC3333">Hero raises to $10</font>, <font color="#CC3333">SB raises to $48.5</font>, Hero ???

My reads: The SB has to have some sort of hand to defend &amp; then bet. Maybe 99-JJ. Think he would re-raise preflop with KK,QQ. Could have big suited connecter &amp; be on heart draw. Could put me on a steal &amp; be aggressively defending. Did not want to call, felt push or fold.

Thoughts?