Our TG Caption

The librarian tells you:
"Come with me..."
She seems a little nervous. Curious, you follow her. She brings you to a "Staff only" room. She locks the door and turn towards you. During a small instant, you wonder if she just want to have sex a last time as a woman before the Gender Wave hits... But she soon start talking seriously, almost whispering:
"-It's a book that I shouldn't have here, at the library.
-What?!
-It's a forbidden History book. It contains some informations that would never appear in an usual History book... The government asked all librarian to burn those books but I kept one secretly in my basement."

You're schocked. What in this book could be so important that modern governements would litteraly ask for a secret auto-da-fé?
"You seem nice so I will tell you why I'm reading it today."
The word "today" made you realise:
"-Let me guess... It has informations about the Gender Wave?
-Well... kind of...
-What do you mean?
-Apparently, there has already been a Gender Wave.
-When?
-It happenned twice. One time at the start of writing about 3000 years before BC and the other one during the middle ages in 1095.
-Ok. It's great to know that it happened before but how can it help us today?
-Well, it seems like some middle ages women might have found a way to stop it.
-That's awesome! What is it?
-It's... a spell. It can make a person imune to the wave but...
-But what?
-I think only a witch can cast it.
-Witches?
-Yes, apparently, they existed...
-But?
-This book says that all witches have been burned in 1969.
-That's a shame but anyway, I don't know how we could have found a witch in the small time we have..."
The book have some really interesting informations but it seems like you are destined to be transformed by the Gender Wave.