Heiress Gone Wild by Laura Lee Guhrke

Dear Lady Truelove,
My ward is driving me crazy. I have to marry her off and get her out of my life. There’s just one problem…
When Jonathan Deverill promised a dying friend he’d be guardian to the man’s daughter, he envisioned a girl in pigtails and pinafores, a child he could leave behind in some finishing school. Problem is, his ward is actually a fully-grown, defiant beauty whose longing for romance threatens to make his guardianship a living hell.

New York heiress Marjorie McGann wants a London season and a titled husband who can help her spend the Yankee millions she’s inherited, and she thinks her new British guardian is the perfect person to help her find him. But Jonathan has no intention of letting his friend’s fortune be squandered. Under his watchful, protective eye, Marjorie finds romance hard to come by . . . until one fateful night when her own guardian’s devastating kisses makes her wonder if the greatest romance of all might be right in front of her.