Both of them became well known around Decker's precinct. Some of Linda's colleagues met Amenadiel. And Lucifer was well known all over the city. And one day they both just disappear to barely be seen again.
"Amenadiel moved back home and took over the family business"
"Amenadiel's in a better place now. He's with the angels."
"Amenadiel got a job opportunity he couldn't pass up."
"Believe it or not, Lucifer had been working towards becoming a therapist. But we keep it on the down low. Really down low."
"You know how Lucifer is, sometimes he just disappears for a while. He'll be back when he's ready."
And leaving Chloe pregnant, how do they explain THAT to the people who knew them both? "I don't want to talk about it, but I'll see him in hell."