Sold to the Snake King in My Sister's Place, My Werewolf Ex Regrets

Summary

My adopted sister stole my potion and became famous overnight. What didn't she know? That potion was being used by the Snake Clan to choose a bride for their heir. The next day, a marriage proposal arrived. For her.For the woman who created the potion. My fiancé panicked.That same night, he marked my sister and made her his mate. Then she came to gloat. "Your fiancé is mine now.Three more days and you'll turn twenty-five.No mate. No husband.You'll be matched with some old abusive rogue."