Back on topic: I remember someone mentioning this before in Sganime or something, yes Takeru's hand shows that he'd be ontop of her, but he's probably just kissing her? He mentioned to his 2 friends that he "won't do those things" when they were talking to him about Hikari at lunch time at school.
Furthermore, I can see why you guys would like Konomini hentai. But I certainly wouldn't, Hikari and Akari are very "pure"; they don't commit sins (Akari's Kuon stealing stuff is kind of an exeption I guess) and they're just "perfect" in the humanity sense. I don't see them just having sex for pleasure like teens do nowadays.