From Episode 5:
Megumi: I can't believe you're already here!
Ayato: What do you mean by that?
Itsuki: What she means is that you're staying at her house.
Megumi: It isn't my house, it's my uncle's, all right? I just happen to live next door, so keep your pants on, okay?
Ayato: That shouldn't be a problem here.
Megumi: What's with the attitude? *notices Ayato's borrowed pink suitcase* Wow, talk about bad taste.
Ayato: Talk about anal compulsive.
Itsuki: My, what a sweet little couple you make.
*Ayato and Megumi recoil in horror*