Diluc was somewhere with grapes, he called that place "heaven". His father told him to pick some grapes to make grapejuice when they get home, and he was more than happy to do so. As he was picking the grapes, Kaeya put grapes in Dilucs shirt as a joke. Diluc immediately turned around to Kaeya, trying to get the grapes out of shirt.

"Hey! That's not funny Kaeya!"

Diluc said as Kaeya laughed and Diluc was still trying to get the grapes out