THE SPITEFUL BRIDE: Marry rival's son

"Let's get married," Mia declares, her voice trembling despite her defiant gaze into Stefan's guarded brown eyes. She needs this, even if he seems untouchable.
Stefan raises a skeptical brow. "And why would I do that?" His voice was low, like a warning, and it made her shiver even though she tried not to show it.
"We both have one thing in common," Mia continues, her gaze unwavering. "Shitty fathers. They want to take what's ours and give it to who they think deserves it." A pointed pause hangs in the air. "The only difference between us is that you're an illegitimate child, and I'm not."
Stefan studies her, the heiress in her designer armor, the fire in her eyes that matches the burn of his own rage. "That's your solution? A wedding band as a weapon?" He said ignoring the part where she just referred to him as an illegitimate child.
"The only weapon they won't see coming." She steps closer, close enough for him to catch the scent of her perfume, gunpowder and jasmine. "Our fathers stole our birthrights. The sole reason they betrayed us. We join forces, create our own empire that'll bring down theirs." 
A beat of silence. Then, Stefan's mouth curves into something sharp. "One condition," he murmurs, closing the distance. "No divorces. No surrenders. If we're doing this, it's for life"
"Deal" Mia said without missing a beat. Her father wants to destroy her life. She wouldn't give him the pleasure, she would destroy her life as she seems fit.
................
Two shattered heirs. One deadly vow. A marriage built on revenge.
Mia Meyers was born to rule her father’s empire (so she thought), until he named his bastard son heir instead.  
Stefan Sterling knows the sting of betrayal too. His father discarded him like trash.  
Now the rivals' disgraced children have a poisonous proposal:  
Marry for vengeance.  
Crush their fathers' legacies.  
Never speak of divorce. Whoever cracks first loses everything.  
Can these two rivals, united by their vengeful hearts, pull off a marriage of convenience to reclaim what they believe is rightfully theirs? Or will their fathers' animosity, and their own complicated pasts tear their fragile alliance apart?