AQ flopped 2 pair villain check/raise

[Ostarr]

PokerStars No-Limit Hold'em, $0.25 BB (6 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

CO ($28.30)
Button ($26.70)
SB ($24.05)
BB ($25) --> 38/31/3 über 58 hände
Hero (UTG) ($48.15)
MP ($23.95)

Preflop: Hero is UTG with :ac, :qc
Hero raises to $1, 4 folds, BB calls $0.75

Flop: ($2.10) :as, :qh, :kh (2 players)
BB checks, Hero bets $1.25, BB raises to $4, Hero ????