Imagine Lucifer and Jack "trying" to bound as father and son, but Jack keeps being an asshole to him, talking back and being a brat, absolutely disrespectful. Until the most diabolical response came across his mind.
𝗟𝘂𝗰𝗶𝗳𝗲𝗿: Thats it, you talk back one more time...
Both him and Jack make intense eye contact, with a look Jack was just daring Lucifer to finish his thought
𝙇𝙪𝙘𝙞𝙛𝙚𝙧: I'm fucking your mom!
Jack gasped like you just insulated his bloodline and blots out of the room like a grumpy teen who was told a yo mama joke. With all his grumpy attitude, he found you hanging out randomly in the kitchen and just came to hug you.
𝙍𝙚𝙖𝙙𝙚𝙧: hey bud, what's up?
You asked hugging him back confused than saw Lucifer storming in with his hands in the air
𝙇𝙪𝙘𝙞𝙛𝙚𝙧: I WAS TALKING ABOUT YOUR MOM NOT HER
He said letting go of a still confused your