[ When Rin takes Gray to not a house or flat, but instead a very public inn, Gray is initially puzzled. But when she stops to think about it — ah. Of course. Rin's actual residence probably doubles as her mage workshop, so she naturally wouldn't want to take the "enemy" there...

Having thoroughly and unwittingly bailed Rin out, Gray asks no questions as she drops her overnight things off and they make their way to the hot springs. ]

Hm? No, I explained that I would be away for the whole night.

[ The boys of the house are generally hands-off and supportive about Gray doing whatever she wants. Only maybe Dokja would have had questions if she'd said she was staying over with a boy... ]

... To be honest, I've never done anything like this before. A sleepover, I mean.