The Dilatory Groom by Karla Hocker
An old Valentine's Day custom allows that, in a leap year, a lady may woo the gentleman of her choice. After waiting an eternity for her girlhood sweetheart to offer for her hand, Claire decides that this St. Valentine's Day, it is she who will do the proposing!
The Crystal Heart by Mary Kingsley
When the Viscount Kirkwood accepts a wager to hold down a position for six months, he never dreams he'll become a librarian for the Valentine family at Heart's Ease, their country estate. But he is delighted to make the acquaintance of the family's charming governess, Alana, who promises him a most intriguing and romantic Valentine's Day.
Fit for a Prince by Anthea Malcolm
His decision to do his duty and find a suitable wife seems perfectly reasonable to Simon, Prince di Tassio. What he doesn't anticipate is encountering his former love, Justine, and becoming caught up in a host of romantic entanglements at a Valentine's Day houseparty he will never forget.