Mary: Oh well. That aside, this is a great chance for all of us to cut loose with the kinky stuff.
Yui: Chance? What do you mean?
Mary: So long as you're in this world, you can, say, upload erotic photos of yourself online, or prostitute yourself to old men, and none of it would have happened once we go back to our original world.
Hikari: Eeehh? Is that true? So it will all be gone just like that?
Mary: Yes, exactly. Everything would have never happened.
Mary: Let's say we were to save Sumire. Then the world would return to as it was, one where she has always existed.
Mary: All the actions we would have took to save her would be impossible since she's already there!
Mary: This is causality... well, the details are hard to explain, but suffice to say that if we were to return things to the proper order, one where Sumire-chan ahs not gone missing, then the future will also be reconstructed thus.
Mary:In short, just think of it as coming back to a parallel world. That's how it would be perceived, anyway.
Mary: What I mean to say is, well, this world is only temporary. Feel free to cut loose while you're abroad, as they say. There's no time like now if you want to go wild with sex.
Hikari: Even if you tell us to "go wild", I don't really have much interest for things like that though...
Yui: Hikari-senpai's pretty popular among the boys, but she would always reject them when they confess.
Hikari: Yep, I think it's more fun to be in club activities with you guys.
Mary: You're lying. Everyone should be interested in sex.
Hikari: I-I'm telling the truth though!?
Mary: Humans have three main desires. Eat, sleep and sex, those are the desires that everyone has. You aren't exempted, Hikari-chan.
Hikari: E-Even if you say that, is Reika-san even interested in sex?
Reika: Eh, me...?
Hikari: Even somebody who's as responsible as Reika, always strict with herself, even her...
Reika: Would she even think about doing perverted stuff?
Mary: Of course. You're the same too, right, Reika-san?
Reika: We...Well, as much as the average person, I guess.
Hikari: I... I see...
Mary: Don't worry, Hikari-chan. You aren't the only person who schlicks in private.
Hikari: Phew, that's a reli...
Hikari:...wait, what!?
Yui: So you masturbate by yoursself too, Hikari-senpai? I can't really imagine that.
Hikari: N-No... um... erm...
Mary: Yui-chan, every girl is a sexual organism. That's how we humans managed to achieve the peak of civilization we have now.