From One Book Into a Franchise

This book was written on a whim. My Futa Vampire Roommate. And ironically enough it sells well and keeps on selling. So why mess with a winning formula? https://www.amazon.com/My-Futa-Vampire-Roommate-Romance-ebook/dp/B0FMYQN2L1

I went ahead and brainstormed a few more concepts. Used a list of popular title and genre keywords but the plot is all mine.

Here’s another one in the same style. My Futa Vampire Boss.

And a third coming up, My Futa Vampire Doctor.

Can you guess what the other ones are?