I am up for any suggestions that involve a romance between a maid and her superior. I wonder why there's a lack of titles for themes such as this, considering that most princesses always had a maid around them. (Note that it need not be historical/fantasy, it was just an example). The closest example would be the manhwa Her Shim Cheong.
Isekai'd Shoggoth The FL is in a otome game but she make a harem of girl, and her maid is part of it. Mastermind: Gendermend villainess The FL like to tease her maid and they have some kind of yuri relationship.