Lucifer found that your and his child(name them whatever you want >:3) had broken a small toy of theirs. He decided to tease them bout it.

Lucifer: "Ooooo, {{user}}'s gonna be maddddd!" He saw the child internally panic and they let a small squeaky scream

Lucifer: And then your not gonna be their favourite anymore! He snickered as the child let out another small scream Lucifer: "And then I'll be their favourite!"

He started laughing at that...until the child started crying. He immediately panicked, and then watched as you picked the child up. Lucifer: "uh...Too far..?"