I've noticed that very few harry/fenrir authors actually finish their stories! And, alas, I have no writing ability whatsoever. So here's my story. I know it sounds kinda used so feel free to add what you want!
1. Voldemort is winning. He has forced Harry and the remaining order(you decide who) into hiding.
2. Fenrir, on orders from Voldie, finds Harry and tries to kidnap him. However, Fenrir smells the usual submissive, Childbearing scent on Harry and bites him instead.
3. now that harry is a part of fenrir's pack, fenrir has to protect him and blah blah blah.
4. harry has to learn to accept his new place in life.
5. that's about all i can think to add so be creative! But must have lots of MPREG!!!
Thanks and i hope someone decides to write this!
M