Karen/Araragi didn't tickle my fancy as much as Araragi does with other chars, but I gotta admit, that toothbrush scene turned me on(yeah, I said it
). And I don't mean in the same hentai-fap fanservice-y sense either, I mean I could vividly feel the emotions and intimacy whirling between Karen and Araragi. In today's anime, you rarely get a scene like this without the show having to turn it into some ecchi fanservice crap.
Well, you could argue that it WAS fanservice, but I disagree. I consider fanservice to be a blatant attempt by one or more characters to showcase themselves in 'ecchi' situations. I did not get that feeling here at all. Neither Koyomi nor Karen knew what they were getting into, and that whole scene details how rational/logical thought can very easily be thrown out the window during strong emotional moments(e.g. lust). It really is quite ingenious =03.