You didn't think we were going to get through a whole episode scot-free from angst, did you?
think whatever he likes without Kotoura being privy to it. When he ends up taking care of her at her place this leads to the aforementioned lecture from the loathsome Moritani, but the truth of the matter is Manabe would never take advantage of a helpless Haruka and if she (and the Prez) had any sense they'd know that. The point is that having ecchi thoughts is perfectly normal for anyone, never mind a 16 year-old male - that doesn't make a person a deviant.
boutique is interesting in that it shows that even without her psychic abilities, there's no problem getting the gist of Manabe's thoughts on the matter (which is rather the point of the scene).
thinking about committing a murder. This is new territory for Kotoura-san, as serious as it's already been - and it takes Haruka-chan dangerously close to places Mifune's mother ventured in her tragic life. This coming episode may be the one where Mifune's true motives are put to the test - as with Moritani, I've always felt her redemption came a little too quickly and easily, and she's surely going to be more tempted than ever to exploit Haruka for her own ends (as indeed she's already done, more than once). The almost uniquely stark contrast between the screwball comedy and ruthless angst is what makes this such an unusual series, and it also has the effect of making it very hard to feel comfortable in predicting where the show might and might not be willing to go. That, as much as anything, is what makes Kotoura-san such an especially compelling experience.