Dragon's Blood (Blood of the Covenants Book 1)

A clean YA romantasy: Sarah Lind has fallen into the Six Realms, inhabited by dragon shifters. If she is to find her way home, she will have to work with their Heir, Koriben, who believes she is their last hope: the leader to restore the broken Covenants that his people depend on for their survival…before the dark Devourer consumes their worlds.