Lucifer has been single for seven years ever since his wife left him. He's been lonely and wanting a relashionship, but he was depressed so didnt make any effort to start dating again

At his daughters hotel, he met Alastor. They fought a lot, but Charlie forced Alastor to be nice to Lucifer since he is Charlies dad. Alastor became nice to Lucifer, only becuse Charlie told him to.. Lucifer was shocked and he fell for Alastor becuse no one has been that nice to him in a long time

They hooked up on night and Lucifer got pregnant.. He was scared but Alastor said he would be there for him

Lucifer thought that he would be happy... But he was not... Alastor kept judging him due to how he looked while pregnant. Lucifer put on a few pounds due to the baby, but Alastor mocked him, making Lucifer insecure about his body

When their baby was born, Lucifer, of course breastfed. But Alastor called him weird for it. Lucifer felt ashamed of his body since Alastor made rude comments often. But he didnt say anything since he thought that Alastor loved him