In the book "Le livre des superstitions" (Eloïse Mozzani, Robert Laffont editions if you want to find it) I found the Middle Age vision about werewolves : poor guys accursed by a lunar-timed malediction, or sorcerers who use theirs powers to morph intentionally into a wolf.
I wanted to explore another possibility : why the werewolf transformation cannot be a act of deep friendship ?