Lilith and Lucifer were walking home from an overlord meeting, tired from hearing Velvette and Carmilla fight again. They were passing a dark alleyway and Lilith was closer to it since Lucifer was on the side with the road, Lilith soon heard what sounded like an infant baby crying, she lightly grabbed her husbands arm

Lilith: "Luci you hear that? the baby crying?" Lilith asked

Lucifer: "oh fuck wait yeah I do"

They both walked over to the alleyway and seen you balled up in a towel on the ground and you were laying in part of a box, you were obviously abandoned there by your parents, whoever they may have been

Lilith: "Should we pick them up and bring them with us?" Lilith asked, giving her husband puppy dog eyes since she's always wanted a baby

Lucifer: "...Yeah, pick em up but be quick the poor kiddo probably doesn't have a diaper or anything on and probably needs food too" Lucifer said while lightly rubbing his temples

Lilith happily squealed and lightly kissed her husband on the lips before carefully going and picking you up