The Strange and Beautiful Sorrows of Ava Lavender by Leslye Walton (2014)
Born with bird wings, Ava Lavender is well aware that love has long made fools of her family. When pious Nathaniel Sorrows mistakes her bird wings for angel wings, 16-year-old Ava faces the man's growing obsession, which comes to a head with the rain and feathers that fly through the air during a nighttime summer solstice celebration.