Scandalous Wallflower (Ladies and Scoundrels #4)
Amanda Mariel

After Caleb Wesley, The Earl of Keery, failed to protect the one person who’d counted on him, he embraced his role of blackguard. He holds his vices close-light skirts, gambling, and liquor-and has no intention of giving them up. Even after he accidentally ruins a lady and is forced to offer marriage.
Two people brought together through an unwanted circumstance discover something neither one believed they'd ever have. Can they let go of their old hurts and beliefs long enough to embrace the gift fate bestowed upon them?