There are 4 books in the Properly Spanked series. The newest book is Under A Duke's Hand which came out in 2015.

1
Training Lady Townsend

Book cover of Training Lady Townsend
Take a rousing romp through 1790s England with this first of four Properly Spanked novels…

The Lady Aurelia has been promised in marriage to the Marquess of Townsend since she was four and he was fourteen. Unfortunately, she grew up into a pillar of propriety while her betrothed grew up…
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2
To Tame A Countess

Book cover of To Tame A Countess
Take a rousing romp through 1790s England with this second of four Properly Spanked novels…The Earl of Warren never considered himself the heroic type—or the marrying type. Unfortunately, while attempting to save the mysterious Lady Maitland from the clutches of a degenerate fortune hunter, he ends up shackled to her…

3
My Naughty Minette

Book cover of My Naughty Minette
Take a rousing romp through 1790s England with this third book in the Properly Spanked series…The Earl of Augustine has always thought of Lady Minette as a sister, but when a nocturnal adventure goes horribly awry, he’s forced to make her his bride.Now his friend Warren is furious with him,…

4
Under A Duke's Hand

Book cover of Under A Duke's Hand
Take a rousing romp through 1790s England with this fourth and final book in the Properly Spanked series…A duke as wealthy and powerful as the Duke of Arlington requires, by matter of course, an elegant, perfectly pedigreed bride. Unfortunately, he must settle for the king’s choice: Miss Guinevere Vaughn, the…