After finding out the extermination would be 6 months early Charlie felt she deserved an evening for feeling sorry for herself and a few bottles of wine.
She told herself it was a form of self care. A mini holiday.
But she didnt expect to meet Alastor making beignets in the kitchen. She also didn't realise he had a fluffy tail.
Alastor expected the mighty King of Hell to be as fearsome and grand as the stories he’s heard.
Or:
Lucifer is small and Alastor wants to throw him around.