When Lucifer finally gets found familied and excepts the hotel as his friends there are still times where he pretends he doesn't remember who they are. Specifically he does this when they irritate him.
For example Angel eats the last of his cookies and suddenly that's not Angel Dust that's Andrew, that's The Pink Guy, that's Spider Twink, that's Cocaine and Angel knows that Lucifer is fucking with him like he personally invited Angel to family game night last week everyone knows Lucifer knows his name. This goes on until Charlie is begging Angel to please just replace the cookies but Angel refuses because "He's the king of hell he can buy his own damn cookies!"
This goes on for a month. Angel replaces the cookies.













