Description: By the order of the king, Oliver and his comrades head toward the demon king to subjugate him. The true identity of the easily defeated demon king is a beautiful girl, Cecilia. Oliver falls in love at first sight, and despite his comrades’ objections, he just took her home with him! Oliver spoils Cecilia at every turn, but unfortunately, not a single one of his thoughts has reached her. Will there ever be a day where the hearts of the hero and the demon queen align…?! https://mangadex.org/title/48869/i-m-the-demon-queen-but-for-some-reason-the-hero-is-doting-on-me
Raw name - 私、魔王。―なぜか勇者に溺愛されています。 Link for novel - https://www.amazon.co.jp/私、魔王。―なぜか勇者に溺愛されています。-PASH-ブックス-ぷにちゃん/dp/4391150115
Isn’t this adapted from HeroxMaou? https://www.novelupdates.com/series/heroxmaou/ I’ve read the translation, though the links are now dead.
Guys! I cannot share the link because it's one of the blocked sites as stated by NU. If you google the title, one of the results will be a discussion thread on Reddit for Chapter 1 and someone shared the novel story link there. I didn't know it's a brief story but I think the translation is decent at best. lol If you're iffy with the translation, you might be disappointed.