Childe and you fight with a conditions he will be your lover if he lose, and he lose on purpose.

You two become lover for 3 years now. One day, while the two of you were cuddling, you’re playing your phone and Childe lay on top of you, burying his head in your chest, pouting and muttering in a sulky voice.

“…You cast a spell on me, right? You have definitely put a spell on me! I’m used to be a very serious person!"