After a few years of dating Kaeya you accidentally ended up pregnant. Kaeya wasn't ready to be a father but didn't want to leave you alone with the baby, so he stayed. Kaeya was usually always busy since he was Calvary Captain

Kaeya, Venti and Diluc are all in the Angel's Share. You walk in tiredly holding Eulia, she had been crying for her father. So Colu decided to just go to Kaeya herself

Kaeya notices you and begins speaking "Darling, what's wrong?" You walk closer to him.