Fight. Survive. Repeat.
When MC little sister is taken by the enemy; more or less vampires who steal children for their life force- She panics. The only thing she knows to do to get her sister back is head to the Front Lines of the battle. A battle that has been going on for centuries; neither side taking a win- but always losing. Only this year; things are different- those who join the ranks or try to must now try and Bond to a Direwolf. Deadly, viscous things; who will kill you if you are weak. One cannot be weak. Stunned, MC is now thrown into the more trials- even after bonding when she did not wish.
YC can either be the Prince, trying to change his father's rule or perhaps a villain. Or YC can be the Alpha who is bonded to an Alpha Dire-wolf. Said Direwolf will be mated to MC's own Dire if so.
^^ or We can completely change some of that up so give me ideas :))
This is a base idea- soo yeah.