I'm not sure about this hand vis-a-vis counterplay. On the one hand, I feel like I performed the strategy correctly, and if I had been playing normally he may have stacked me. On the other hand, bet so much it hurts when he pees backfired. Thoughts?

Party Poker Pot-Limit Hold'em, $ BB (10 handed) FTR converter on zerodivide.cx

UTG+1 ($24)
UTG+2 ($21.75)
MP1 ($23.75)
MP2 ($25.97)
MP3 ($47.05)
CO ($32.55)
Button ($12.60)
SB ($4.50)
BB ($24.43)
Hero ($24.75)

Preflop: Hero is UTG with A, A. SB posts a blind of $0.10.
Hero calls $0.25, 1 fold, UTG+2 calls $0.25, 1 fold, MP2 raises to $0.5, 4 folds, BB calls $0.25, Hero calls $0.25, UTG+2 calls $0.25.

Flop: ($2.10) K, 5, 2 (4 players)
BB checks, Hero checks, UTG+2 checks, MP2 bets $0.5, BB folds, Hero calls $0.50, UTG+2 calls $0.50.

Turn: ($3.60) 7 (3 players)
Hero checks, UTG+2 checks, MP2 bets $0.5, Hero raises to $3, UTG+2 folds, MP2 calls $2.50.

River: ($9.60) 4 (2 players)
Hero bets $4, MP2 calls $4.

Final Pot: $17.60

Results in white below:
Hero has As Ad (one pair, aces).
MP2 has 2s 2d (three of a kind, twos).
Outcome: MP2 wins $17.60.