Harry/Snape Slave spell fic

[Guest Eternallysilent]

I’m looking for a Harry/Snape fic where Snape and Dumbledore find a spell that would destroy Voldemort. I’ts a slavery spell that Harry has to freely give all his rights over to Snape. I remember that there were several stages of the spell like first signing a contract that makes him property. Then harry has to drink a potion and eat and drink what Snape offers him. There is also a bath and sex involved in the spell. I remember that Harry has to test all theses potions ingredients to make sure he does not have a allergic reaction to any of them and he ends up getting high on like essence of unicorn or dragon or something like that. Any help with finding this fic would be appreciated.

[NobbyPotter]

The story you are looking for is Cambiare Podentes: Invocare by Jordan Grant.

http://archiveofourown.org/works/714361/chapters/1321936

and the sequel is Cambiare Podentes: Madurare

http://archiveofourown.org/works/739521/chapters/1376720

[Guest Eternallysilent]

This is it!!!!! Thank you so much.