aa vs mid stack

with no reads, is this a definte fold after the 3-bet? the way he played, chances are too high he hit a set or two pair to call off the last $4, right?
anything else you would do different?

PokerStars No-Limit Hold'em, $0.25 BB (9 handed) FTR converter on zerodivide.cx

MP3 ($19.45)
CO ($13.75)
Button ($10.90)
SB ($25.75)
BB ($25)
UTG ($19.10)
UTG+1 ($15.40)
MP1 ($15.95)
Hero ($26.20)

Preflop: Hero is MP2 with A:club:, A:spade:.
UTG calls $0.25, 1 fold, MP1 calls $0.25, Hero raises to $1.5, MP3 calls $1.50, 4 folds, UTG folds, MP1 calls $1.25.

Flop: ($5.10) 9:heart:, J:diamond:, 6:spade: (3 players)
MP1 bets $4, Hero raises to $10, MP3 folds, MP1 raises to $14.45, Hero calls $4.45???????????

Very easy call, no question. At 25NL, you're running into AJ most of the time here.

Call. Really, really quickly.

wow, ok i feel much less dumb now...thanks. i think ive had too much of that negative variance stuff and it's made me question this sort of a hand.

If mp3 had pushed, mp1 called AND they both had you covered, I would consider folding, but here you have to call, especially for only $4 more

You are getting 7:1 odds on your call. You will beat 2pair far more often than that. you fear only a set here.