AJ, A on flop against shortstack

No reads, guy just sat down. Should I just call here given opp has only about $6 behind?

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.10/$0.25
8 players
Converter

Stack sizes:
UTG: $37.85
UTG+1: $28
MP1: $25.05
MP2: $10
CO: $9.05
Hero: $24.50
SB: $29.75
BB: $20.05

Pre-flop: (8 players) Hero is Button with A J
3 folds, MP2 (poster) checks, CO raises to $1.25, Hero calls, BB folds, MP2 calls.

Flop: 7 A 9 ($4.13, 4 players)
MP2 bets $2.25, CO folds, Hero raises to $12.25

Not only has he bought in for $10, but he's posted a donkblind in MP.. He's also checked then called a PFR. I'd be happy to get it in here, if he has 97 then meh.

There's a good chance I 3-bet this preflop and get it all in on the flop against a shorty donk blinder. That's not unreasonable.

This looks fine to me. He doesn't have 97; he could have 77, A7, A9, but he could also have any other ace AT down, or even some crap like K9. I don't think you're winning all the time here, but you're certainly winning enough for it to be a fine bet.

Any reads/stats on CO? I don't like flat-calling with AJo pre-flop, it's a reverse implied odds hand. As played, the flop push is good.

I fold PF without blinking an eye. Then in a few days or weeks I probably realize it was a leak of me - thats how it usually goes