[Request].... need help finding the name of an anime.

A long while ago I watched an episode of an hentai/anime, but I can't remember it's name & most of the plot of what I watched. I say hentai/anime because I can't remember if it was hentai or anime.

I do remember the main character was an escorting someone of nobility somewhere, and he/she changes gender. I think the change happens at night, though don't quote me on that

Before anybody jumps to conclusion the hentai/anime I'm looking for is not "Maze☆Bakunetsu Jikuu". I've checked & though it has similar themes, that is not it.