Sakura and Shirou
The two of them followed after Irisviel as she checked out the rest of the apartment, finding two bedrooms that, to their relief, appeared to both be double rooms. Quickly and decisively claiming the sofa, Irisviel then excused herself and went to have a bath.
Returning to the room, they found that Shinobu had removed her top to reveal a black dress showing off her ample cleavage, which Medaka was not-at-all-subtly admiring. The two of them giggled slightly at the display of lust from the blue-haired girl, but they couldn't really blame her. After all, if Sakura was wearing such a dress, Shirou knew he would be admiring her in just the same way. Shinobu then whispered something into the Medaka's ear, causing her to tense up and, then, walk off to knock on the bathroom door. Shinobu, meanwhile, addressed them once more.
"You would be surprised if you knew how frequently traps are where you least expect it", she said. "It may even be that someone who is angered by the landlady has snuck in unawares and placed one here."
Sakura smiled gently.
"Yes, I suppose you're right", she responded, shrugging her shoulders.
"Anyway, fortunately, it appears that this apartment has two double bedrooms, so we don't need to worry about who gets to sleep with their partners", she continued.
"You and Medaka can choose which one you'd prefer", Shirou added, "we'll take the other one. They're both fairly similar anyway."