AA facing raise on wet board

[lNormajean]

villian is 20/17 over 150 we havent got any relevant history.

i really get lost in situations like these with an overpair out of position. my first instinct was to flat and then bet any non diamond 7 8 or 9 but this is probably bad. almost as bad as jamming, i dno. help
thanks

PokerStars No-Limit Hold'em, $0.50 BB (5 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

Button ($58.25)
SB ($30)
BB ($60.35)
UTG ($65.15)
Hero (MP) ($67.75)

Preflop: Hero is MP with A, A
1 fold, Hero bets $1.50, Button calls $1.50, SB calls $1.25, 1 fold

Flop: ($5) 9, 6, 5 (3 players)
SB checks, Hero bets $3.50, Button raises to $13

edit: sb folds btw