I don't know if I played this right. On a flop like this I assume he was drawing. But laying down AA here? Would you do it?

PokerStars No-Limit Hold'em, $0.10 BB (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG ($4.20)
UTG+1 ($15.45)
MP1 ($7.95)
Hero ($9.85)
CO ($5.60)
Button ($7.15)
SB ($3.95)
BB ($6)

Preflop: Hero is MP2 with A, A.
UTG calls $0.10, UTG+1 calls $0.10, 1 fold, Hero raises to $0.4, 3 folds, BB calls $0.30, UTG calls $0.30, UTG+1 calls $0.30.

Flop: ($1.65) Q, 5, 3 (4 players)
BB checks, UTG checks, UTG+1 bets $0.4, Hero raises to $1.6, BB folds, UTG folds, UTG+1 raises to $2.8, Hero raises to $7.85, UTG+1 raises to $15.3, Hero calls $1.60 (All-In).

Turn: ($26.40) A (2 players, 1 all-in)

River: ($26.40) 9 (2 players, 1 all-in)

Final Pot: $26.40

Results in white below:
UTG+1 has 5s 5d (three of a kind, fives).
Hero has Ad Ah (three of a kind, aces).
Outcome: Hero wins $20.55. UTG+1 wins $5.85.