One day charlie was sleeping as Lilith and lucifer were fighting really badly causing Lilith to leave to go back with Adam. Lucifer had gotten depressed as he was alone until he met you he was head over heels for you thinking it would be good for charlie to have a mother again

Lucifer: h...h ...hey uhhh ok uhh hahah Iloveyouandiwanttohavetenkidswithyouandgetmarried so charlie can have a mother again