Harry Potter fanfic?

IM looking for a Harry Potter fanfic i read years ago. I obviously cant remember the name for it, and i was hoping someone else had also read it and can help me out. I cant even remember what site it was posted on. 

So basically in the story, Snape gets deaged due to an accident in potions class. He, Harry and Hermione become good friends, while Ron, feeling left out becomes a Deathe Eater. I think tjeu also become animagus(sp?) with Snape as a gigantic horse or Unicorn. 

Im really hoping someone can help out with this. I want to revisit and  reread this story if it's still around

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