Sakura and Shirou
Sakura and Shirou smiled right back at the blue-haired girl, acknowedging her words and her acceptance of their apology. Then, their two housemates left, to "inspect their room", a knowing smile flashing over the face of both Emiyas as they heard Shinobu's words. Unsure what to do, the two of them milled around for a few minutes before deciding that they were both tired and perhaps should also head to bed. Before they could do so, though, Irisviel came out of the bathroom, wearing a rather fancy but extremely low-cut black dress.
"Hi—", she said, before yawning. "Sorry, I'm pretty exhausted."
For a moment, Shirou found himself staring at the white-haired woman's ample cleavage, before catching himself and quickly looking away, desperately looking around the room in embarrassment, trying not to stare at the alluring sight. Sakura, meanwhile, after a momentary glance at the woman's rather-appealing bosom, looked firmly into her eyes, her gase not moving as she too tried to avoid gasing downwards.
"Hi", Sakura responded, also yawning in response to Irisviel's yawn, her eyes firmly focussed on the woman's face.
Shirou, meanwhile, began to compose himself, also staring as best as he could at the woman's face, his elevated position allowing him an unintended but very erotic view down her top even as he tried to avoid staring.
"Hi Irisviel", he said with a somewhat embarrassed smile, before also yawning. "Yeah, we're tired too. It's been a long day."