Summer’s Child by Cari Z.

Will the distant but brutal past destroy a changeling’s hope for a better life with the summer fae?

Dis, a human changeling, is tasked with delivering Oberon’s Solstice gift to his estranged wife Titania at the Summer Court. Leaving behind the land where he barely survived to adulthood is harder than he expected, because it means leaving behind his lover Marten as well. Dis hopes that once his task is completed, he and Marten can be together again.
The summer fae welcome Dis to their court, but there’s more going on behind the scenes than meets the eye. Dis struggles to keep Oberon’s gift for Titania safe while being continually tempted by the willful summer fae to disobey, and worse, he loses contact with Marten. Dis is left with no one he can trust and is faced with the impossible choice between disobedience to Oberon, who will surely kill him once he finds out, or losing the man that he loves forever.