Headcannon: F!Robin finds her S/O asleep in her room because they where waiting for her.
- If this was not a usual thing, Robin would find it really sweet. She'd probably just try her best to slip into bed beside them without disturbing them. The next morning, she'd try to wake up a bit before them so she could grab them some breakfast as a gesture of appreciation, as well as an apology she couldn't get back early enough for them to spend time together.
-If it was a more common thing that happens, Robin might feel a bit guilty about how much time they spend away from her partner, and, when she has time, will bring it up with them to see if they're as bothered by it as she is. She'd try her best to cut down her working hours a bit so she can devote more time to them, even if they say that it doesn't bother them.
-She might get a bit flustered when walking out with them in the mornings if they don't typically share a room together, especially if there's some teasing from the friends around them both, but that certainly wouldn't mean she wouldn't also be a bit proud to make it clear that she and her partner are together.