When I was younger there was a big trope of two “bad boys” making a bet about the angel of the school. So bad boy A tells bad boy B that they won’t be able to get the Angel into the bed/have sex with them. So after making the bet bad boy B goes out of his way to “befriend” and “romance” the Angel, while slowly falling in love with them.
Well, the ending was always the same and boring and cliche and honestly I stopped liking the trope very soon because it was often very poorly exectued.
But now I want that with ChiLumi, but Lumine is asexual as hell. While trying to get closer to her, Childe figures out that Lumine was adopted and that she had a twin brother, who had been adopted by another family. So now Lumine tries to find her brother with the help of Zhongli (also asexual as hell), who seems to know way too much.
Bad boy A is one of the other Harbringers. Maybe Singora, who just makes an off-hand comment and Childe takes it as a challenge. (This could also turn into a ChiLiMe (Childe x Lumine x Zhongli) story.)
Childe’s parents are so happy that their son is finally hanging out with normal people. Little did they know that Lumine and Zhongli are not normal, just not some gangsters... (Don’t challenge Lumine and Zhongli, if they hit, they hit hard!)