It's kinda a huge deal when Aqua admitted inwardly that he wasn't lying that he thinks of Kana as cute. Guess you can't shake that first childhood crush.

The dude has frequently professed that his only love is Ai or sibling-style affection for Ruby, and Sarina before.

He's so manipulative and clinical about interacting with women (hence the getting stabbed at night comment from the three), it becomes really interesting that Kana and Aqua actually relax their public personas around each other. They just don't even attempt to lie, persuade, or seduce one another like most people do day to day. Kana is shown to be sweet, friendly, a bit of an airhead, and receptive towards others (even outside the profession), when her real personality is quite shrewd, calculating, and strategic, much like Aqua's own.

I guess Ruby wasn't wrong that Kana attracts creepy types of otaku...