No Man’s Bride by Shana Galen

She’s an Outcast Who’s Vowed Never to Marry
Catherine Fullbright has sworn off marriage. Her abusive father has made her wary of men and long for independence, and she has a plan to escape her family home. Catie’s younger sister is the apple of their father’s eye and betrothed to a wealthy lord. But when a more advantageous suitor shows interest in Catie’s sister, Catie finds herself standing at the altar with her sister’s betrothed and no memory of how she came to be there.

He’s a Political Insider Who Needs the Perfect Wife
Quint Childers, the fifth Earl of Valentine and heir to a marquessate, has a bright political future. He’s well on his way to the role of prime minister. The one thing he lacks is the perfect wife—a faultless hostess with impeccable taste to shine on his arm. But when he wakes up naked in bed with Catherine Fullbright, his dreams are shattered. Catie is impulsive, argumentative, and wants nothing to do with him.

But there’s one thing Quint hates more than being tricked into marriage—scandal. He vows to win his wife’s affections. The task won’t be easy or without sacrifice, but the more he comes to know Catie, the more he wants her, no matter the cost.