A Crown of Bitter Orange by Laura Florand

Childhood friends.
Tristan Rosier might have asked Malorie Monsard to marry him when he was five years old, but things had only gone downhill from there. She’d spent the rest of their lives ignoring him, abandoning him, and destroying his perfumes. Now she was back, to wreak who knew what havoc on his life.

Lifelong enemies.
Tristan might choose to dismiss the generations-long enmity between their two families, but Malorie didn’t have that privilege. Like all the other privileges wealthy, gorgeous Tristan took for granted that she couldn’t. But if she was going to restore her family company to glory, she might just need his help.

Or the perfect match?
They’d known each other all their lives. Could these childhood friends and lifelong enemies ever uncross their stars and find happily ever after?