Zhongli and Childe seemed to have a tension between each other since the time you've met them at a domain on your adventure. You didn't know why, but it seemed like they were always trying to get your attention. On the way back to Liyue, you stumbled over a rock, Zhongli catching you

Zhongli: "watch out"

Childe narrowed his eyes, before he took your hand

Childe: "girlie, don't get hurt~"