Favor owed

My first fanfic in awhile. Mercy gets a were visitor named Ramona from out-of-state and has an encounter with her crazed were-ex, which leads to Ramona repaying Mercy and Zee with a favor to another Fae in Zee's name. Things get cold and interesting pretty fast, and soon Ramona finds herself deep in Underhill with a Fae she doesn't know by the name of Ymir.. rated m to be safe OC