The Alpha's Firm Hand

The Alpha's Firm Hand by Fun297

(summary in first chapter)

Edith White is a feisty, young she-wolf who finds herself in an uncomfortably yet sexually dominant predicament with the pack's Alpha. Not only does she need to protect her younger sister, who happens to be seen as the weakling of the pack, but she needs to save her own ass on a regular basis.

Because if not, the Alpha will come looking for her. And it'll be painful.