Lady's Knight by Amie Kaufman and Meagan Spooner

A rollercoaster of a medieval romp and a sapphic love story, set in a world of dragons, witches and excellent snacks.
 
Two maidens. One tournament. A whole heap of medieval trouble.
 
 A blacksmith’s daughter with a secret. A lady with a plan. We’re in for one unforgettable knight… Gwen has spent the past several years manning the blacksmith’s in place of her father, an open secret in the village in which she lives.

A much more covert secret, however, is that she knows not only how to craft but also how to wield a sword, and an incognito stunt at the local jousting tournament manages to catch the eye of the wily Lady Isobelle. Isobelle has secret dreams too, but she’s been promised in marriage to the winner of the whole stupid tournament, which means an end to any freedom or choices for her. Desperate to avoid this fate, when she connects the newcomer knight to the female smithy she saw earlier that day, she begins to hatch a scheme… Petty knights
One particularly large and angry dragon. Will our ladies survive the night? And can our knight save the day? 
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'A sapphic delight, full of jousts, jaunts and courtly love.  Lady’s Knight sparkles with wit and charm.’  C.S. PACAT
'Clever, funny, thrilling, and romantic. Perfect for fans of A Knight’s Tale!’ , F.T. LUKENS