The Look of Love by Meara Platt

When Lady Olivia Gosling finds The Book of Love in a musty bookshop, she is most eager to try out its love “recipes” on someone safe.
Did she say safe?
Well, Beast isn’t really safe, but with her odious guardian about to marry her off to one of his unsavory friends, Olivia needs her childhood friend to fall in love with her… fast. If Beast can love her, then any man she chooses will surely do the same.
Alexander Beastling, Duke of Hartford, is known as Beast among the ton. He is big and muscled, and there is a dark aura of mystery about him that he makes no effort to dispel. Now that he’s returned from battle, he’s appalled to learn of the marriage plans Lady Olivia’s loathsome guardian has for her. Beast has decided that he will help her find a proper husband, even if it means putting up with her ridiculous experiments taken out of a book she refers to as The Book of Love. Olivia calls them magical recipes for love.
Is it possible they actually work? Because suddenly, Beast can’t seem to get Olivia out of his mind… or his heart.