A Midsummer Night’s Kiss by Kate Bateman

Kitty Worth has given up hope that her love for James Cashell will ever be reciprocated. Since his return from the war, her brother’s best friend has refused to even see her, let alone seduce her. So when they both attend a Midsummer wedding at the magical Castle Keyvnor, Kitty decides to choose another man to wed.
James, however, has sworn to protect her, and he’s determined to stop her from making a foolish mistake. If that means showing her just what the perfect kiss should entail, then so be it.
But the course of true love never did run smooth, and with the dubious help of Titania, Queen of the Fairies, there’s a chance that ‘happily-ever-after’ might hinge on a single, Midsummer night’s kiss. . .