Skull Daddy II: Mother / Father by Stephanie Anne

Addy and Everett are struggling. They’ve been trying to conceive
without success and it’s breaking Addy’s heart. Not only that, but
they’re starting to worry that they won’t even be able to afford a child.
So, after much research, they decide to rent out their basement.
Enter Olive, the perfect tenant. Or is she? She’s clean, quiet, and
keeps to herself. Her senior cat, Autumn, doesn’t cause any trouble.

But strange and horrible things have been happening ever since she
moved in. And the friends she keeps inviting over are not the kinds of
people Addy and Everett want in their home.
What does Olive want with this couple? Is she a blessing or a curse?
Only one thing is clear: if Addy wants to become a mother, she’s got
some tough choices to make.