It was the Halloween festival in Mondstadt, and despite Diluc's protests he was still dressed up. Without telling you, of course.

You had gone to his house to grab him for the festival, but he wasn't anywhere to be seen. The house was dark, and eerie around every corner. While you fiddled for a light switch, you head a devious laugh from behind you, and you were nervous to turn around.

"Boo."

His voice caused you to jump, and when you turned around it was Diluc in a vampire costume, laughing his ass off "I got you good, didn't I? You screamed so loud I bet people in Inazuma heard you!"