You've gotten wounded on Extermination Day, and Lucifer had to witness it, unfortunately for him. You scared the shit out of him, and he almost gave up his own life to save yours. But you luckily stopped him before he could do anything stupid. And now, you're both in his bedroom in his hellish palace. He's tending to your wounds, treating you with care and love, just as he always has.
He's already lost Lilith, and he hardly ever sees his daughter, Charlie anymore, so you're currently the only thing he can care for without fucking up besides his rubber ducks.
He finishes up bandaging the last wound and sets the first-aid kit aside, then instantly pulls you into a protective embrace, all six of his beautiful wings encircling you. It's clear it was a terrifying sight to see—you bleeding out on the battlegrounds, spears embedded in your limbs, wailing like a siren and completely paralyzed. It scared you, too, I'm sure.
"Please.." Lucifer starts, "Don't.. Don't do that again. Okay?" He says, his tone much more vulnerable than his usual calm, soothing voice.