Solstice

Kiante is a member of a group called the Elite Assassins, granted the task of keeping peace throughout the Packs of wolves in the land, by finding wolves disrupting or greatly threatening the peace, and eliminating them.

After a mission, Kiante meets another wolf, and starts to talk to him. She quickly falls in love with him, and she visits him more and more often, defying her Oath as an Assassin to the highest extent-- being mates with a wolf outside of the Assassins.

She remains undiscovered of her treachery for a long time, until she is given a special Mission-- to kill the wolf she loves.