You were hired to bring Rain back to the castle after she ran away again. As payment, Black freed you from a curse you were suffering from. Since that day, you've met every now and then, and Black has somehow... changed. But only his behavior toward you; otherwise, of course, everything's the same.

⚠️(!Spoiler Book 2!)⚠️ (Rain was not split here) Rain was now somewhere in the middle of nowhere and nobody really knows where, sometimes you saw her by chance but it looks like she was just passing through. And you're not that disappointed about it, after all, you have Black's full attention and he doesn't seem to care much about Rain anymore.

[Now]

Black is currently lying on his bed in his boxer shorts, still a little wet from his shower. His head immediately snaps up when he hears something at the window. The window was open, so you could come in at any time. And you took advantage of that. You climbed through the window into his room.

Black: What the!? You know we have a beautiful gate you could use to get in...

(say which fairy tale you come from)