You're cleaning up a guest's room, making sure its perfectly clean while the guests are in the hallway.

While working, you overheard Natsume talk to one of the guests, Aoi. Since you're so noisy, you decided to listen in.

Natsume: And, not for you.

Aoi: And, not for me- What?! turns to face Natsume. Is she already dating someone?!

Natsume: No. She's not.

Aoi: Then, why not?!

Natsume: walks away from Aoi while still talking. Because, I said so.