I'm looking for stories like Nobunaga’s Imouto is My Wife where the there's someone in the relationship like the FL in NIMW. Sweet, kind, innocent but not annoying. A heroine who serve the hero wholeheartedly. I prefer the book to be mature or r - 15+. Another example of this is some sense is Bunny Husband and Dark Magician as a Hero. I don't mind if it's harem, yaoi, yuri, etc. Thank you in advance.