I Dumped the Heirs for the Alpha King

Jenny is an omega who works as a maid in the Stormfang Pack, and she gets all five of the Alpha's sons attached to her. She uses that to set up humiliations for Elara, who was adopted by the Alpha ten years earlier and was meant to take one of the five brothers as her mate. It goes on long enough to wear Elara down. On her eighteenth birthday Elara rejects the mate bond with all five brothers in front of the pack and says she is engaged to Xavier Lockhart, a Lycan prince. The brothers work out afterwards what Jenny had been doing to her. They try to get Elara back, by which point she has moved on.