Witches and devils familiars(futa/genderswap massiveharemXmultiple protagonists)

Before I begin the description of this book I want to explain one thing why I chose that Annamae cover of all covers it's because that particular Annamae is very similar to the anime I remember when I was a kid watching but at the same time they are very different so I thought it be a good cover to help express the story and want to create with that out of the way our story begins in the universe similar to our own the only difference every human in that dimension have special hidden power inside of them that they don't even know of this power is known as familiar magic only people who has the ability to become a familiar can use familiar magic familiar magic is really powerful magic that only a familiars can use those different types of it if a witch or a wizard or a devil can get their hands on a potential familiar that our story takes place in the universe of many people who could become familiars that witch or devil or wizard will be able to learn powerful spells from there familiars that they catch and once a devil or Wizard or a witch manage to get their own Familia they are to take that familiar back to their dimension yes the witches and devils and wizards are not actually from the dimension that the potential familiar from but it's a place to go to get there first familiar and when they want more familiars they go back there again to gain more but that's not important what is important a few boys who is born in the universe known as the familiar realm had no idea that today was a special day to them it was just any other day they had no clue there ordinary lives we are going to change when a bunch of witches and devils kidnap them from there universe and turn them into familiars for the journey of a bunch of random guys who have one thing in common then all being kidnapped by devils and witches how will each of these boys handle their new lives not only that there's a side-effect for males being turned into familiars find out in the book