Top 2 pair raised all in

How would you approach this flop, and do you lay this down?
Villian 31/6/1.3 over small sample size of 35 hands

Ultimate Bet No-Limit Hold'em, $1 BB (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

saw flop|saw showdown

Button ($104.15)
SB ($71.95)
BB ($94)
UTG ($60.50)
UTG+1 ($108.45)
UTG+2 ($52)
MP1 ($100.65)
MP2 ($174.20)
Hero ($112.60)
CO ($101.75)

Preflop: Hero is MP3 with Ahttp://www.flopturnriver.com/phpBB2/...miles/club.gif, Khttp://www.flopturnriver.com/phpBB2/...iles/spade.gif.
1 fold, UTG+1 raises to $2, 2 folds, MP2 calls $2, Hero raises to $9.5, CO calls $9.50, 3 folds, UTG+1 calls $7.50, MP2 folds.

Flop: ($32) Ahttp://www.flopturnriver.com/phpBB2/...es/diamond.gif, Jhttp://www.flopturnriver.com/phpBB2/...iles/spade.gif, Khttp://www.flopturnriver.com/phpBB2/...es/diamond.gif (3 players)
UTG+1 checks, Hero bets $20, CO raises all-in

AQ? AK? AJ? KJ? maybe even something stupid and semi-bluffing like QJ, KQ, QQ, TT, KT, JT?

i dont see why CO wouldn't 'value bet' if he had a set or better.

I stacked off with top 2 pair 3 times today.

No way I start folding it here.

Fnord, how often do you win w/ top 2 pair? Do you have stats you can post? Besides premium pairs JJ-AA, 2 pair seems to be the hardest hand for me to judge, so I end up folding it a lot. Stacked off too many times to sets.

Also, when I stack off someone with a set, it seems 2pair is their hand around 50% of the time.

i hate two pair

Ugh, COs huge cold call makes me think you're beat by AA or KK. But unless he's an uber-nit I still put it all in here.

i just had this hand happen to me for a big pot not long ago. I posted it. I got killed by Q10.

It sucked then, it it sucks now! :(