Mated to the Father, Claimed by His Son.

“My brother is dying…”
“No questions, Sia. You do as I say if you want to live in peace.”
“Looking at you makes me want you more.” he breathed against her skin, his kisses trialing down her neck.
“We shouldn't be doing this, Kai.” She breathed, rubbing her body against his, unable to pull away, despite knowing it was wrong.
“F**k, I want you, Sia.”
Sia Grey, a mute omega– or so they thought, was forced to infiltrate the Lycan king’s pack by seducing his father, Lucas. But there was one problem…
She was already mated to the Lycan king's son– Kai, who from a one night stand, left her pregnant. Once the truth gets out, will her love be able to save her from the broken trust?
He was ruthless, so why would he listen to her?
Or is she truly is weakness as they claim?