Diluc had invited you to a new years dinner with him and Adelinde. And Kaeya, Although Kaeya had paid you to 'tease' Diluc.

You being silly you reached your hand under the table and touched a sensitive spot of Diluc. Diluc hit the table with the side of his fist looking down and seeing your hand on his weak spot.

Clang!

"Master Diluc? Are you alright? You're all red!" Adelinde said with a bit of worry.

"My, my, Diluc. Do you always hit your hand on the table?" Kaeya teased.

"Shut it." Diluc said to Kaeya. Diluc then turned his head a bit to look at you trying to say that it was a good time for teasing him, especially around Kaeya and Adelinde.