Sounds interesting as my character has a long relationship with Mephala (ans Azura), though she mainly serves Mephala. Sherethys though is an Ashlands trained Velothi Priestess, meditates on Mephala's will and would have a difficult time accepting a mortal as "Mephala's Voice Incarnate" cause unlike the less experienced, she actually hears Mephaal's voice. Might be interesting to try out but there would defintely be some character conflict, unless maybe Sherethys was recognized as a priestess of the old ways (she reveres all 3 good daedra if she dislikes Boethiah). Add @Sherethys and we'll talk in game.
Call me "Webspinner". Pluck but a single thread, and the weave unravels.