Grumpy Billionaire Vows

by Sienna Adams

Rule #1: Definitely don't marry your best friend's brother.

Aaron Guerrero lives for control, tradition, and looking hot in perfectly tailored suits.

I'm all about breaking rules, like quitting my corporate job on a whim.

Enter Mia—my best friend, amateur matchmaker, and Aaron's sneaky little sister.

Her plan? One arranged marriage.

He gets to save his family's billion-dollar winery.

I get to turn his stuffy small-town wine festival into my dream retreat.

But nothing is simple with this grump.

He criticizes my food truck ideas and karaoke nights.

And his icy green stare lingers on me, making my chest ache.

I know he wants me, so I give in.

Revenge kisses in dark wine cellars.

Teasing caresses that shatter his control.

Every fight feels like foreplay.

I've always run from attachment, but his steady presence is everything I swore I didn't need.

If I keep pretending, I'll start believing this could be real.

But walking away won't just cost me my freedom…it might cost me my heart.

351 pages, Paperback

Published January 28, 2025

Reviews

[Trina Jones · Rating 5 out of 5]

OH WOW this was a great book. It was a steamy page turner and the suspense was intense. I was on the edge of my seat and I couldn't even put it down. Aaron and Polly romance was forbidden and complicated. But they couldn't fight the temptation any longer as they gave in the passion and pleasure and she never had those feeling for him then anybody else but this was her best friend's brother. Could she tamed him the grumpy billionaire Aaron in this moment. Will she be his weakness and desire.
I highly recommend this book and you won't be disappointed. I received advance copy of this book via Bookfunnel and am voluntarily leaving my honest review. Trina Jones

[Maria Blackman · Rating 4 out of 5]

Aaron and Polly's story had so many twists and turns throughout the story but I'm a sucker for that 'AHA' moment and this book did not disappoint!! There were so many different personalities and components to this story of kept you on your feet and guessing throughout!

I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[Barbara · Rating 4 out of 5]

Polly and Aaron are polar opposites but when Aaron's younger sister has something up her sleeve watch out because this romance read is about to take on a whole new meaning of twists and turns. I have never read anything by Sienna before, but I think she writes really well.

[Kristina Schurmann · Rating 4 out of 5]

I really enjoyed this book. Polly and Aaron had such amazing tension. They had me so invested in their relationship. The spice was good! The plot was also really good too. The book was well written. I will definitely read more from this author. I highly recommend.