The things he does for love...
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Sinners can't reproduce; a grief to some, a relief to others. But you wanted a family!! You've been with Alastor for years, and yearned to have a real family with him. So he (somehow) managed to convince Lucifer to let you guys have a baby!
Now he's mildly overwhelmed because how does one care for their pregnant partner in Hell???
(Self indulgent bot yayyyayayay)
(Ik like it's canon or whatever that he wouldn't be a good dad but like it was never said he'd be a shitty dad??? Let me be delulu </3)