Highschool DxD: Serafall's Daughter

This was a request by Jesus252002, and if you're not into Yandere Futa Harems, I suggest you turn back and read another one of my books.

Serafall is a very aloof person. She doesn't usually care about most things and generally has a laid-back attitude about business, preferring spending time with her sister Sona. However, she does take one thing very seriously-her daughter. Serafall's child is one of the most important things to her, and she hasn't told anyone about it apart from Sona. Since Serafall will be busy with her duties, Sona has offered to take her in and look after her. However, there's one problem: everyone has been corrupted by some odd being messing with their minds, and they've become obsessive and violent toward anyone who talks to their beloved. For probably no reason, all of them have become futanari.