Cash by Ember Flint

Cash Stone is a hard-edged businessman that has been in charge of everything around him for as long as he can remember. He is all about work and no play. Set in his ways, he has been disappointed far too many times in his life to do something about it and is now resigned to only do his duty and preserve the prestigious legacy of his family.
He has always been surrounded by money and strangers; his name the perfect label to a life of power, success and loneliness, but everything changes when he meets a twenty-year-old girl who has been as alone as he has, but without the fortune to keep her safe and she instantly slices through the armor protecting his heart.

Aria Murphy is tired of being alone, life has been tough on her and in a cruel twist of fate, the irony of Murphy’s law seems to be following her every step of the way. Anything that could go wrong, did and everyone she has ever loved is now gone.
Just when she thinks her life could not possibly sink any lower, a friendly hand is extended down to her —a friendly hand attached to a crazily big, gorgeous billionaire who wants to sweep her off her feet and make her his forever.

Resisting is futile, even if she wished to: Cash is a true alpha who will stop at nothing to have her and has come up with an astonishing plan to make sure he can buy for himself the chunk of happiness life seems obstinate to deny him.
After all, he owns pretty much everything he sees, so why not sweet innocent Aria as well?