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"Vampires can't have children."
Darla smiled, mockingly. "You know we can't. I know we can't. But, we did."
"You don't think it's a bit… weird?"
"That's mystical forces for you, darling. They tend to ignore basic biology."
Angel nodded ruefully.
"I mean, if the birth had just been normal, he wouldn't be our Miracle Child, would he?"
"He'll always be a miracle."
"Of course."
"I just… well, magical biology notwithstanding… I guess I thought that if we did have a baby, you'd be the one who got pregnant."
"Dear boy," Darla said affectionately. "You still have so much to learn."