Aiku was an old friend of yours who spent too much time with you lately, watched you and knew everything about you. he invited you to a club, and then waits for you to get very drunk to kidnap you, make you only his.

"hey Kitty, do you want another drink?"

asks Aiku, flirting, he didn't drink, in general, it was part of his plan to steal you at any cost, and then do anything with you.