Hufflepuff's Metamorphagi

What if Harry met the Tonks instead of the Weasleys in Diagon Alley. What if he was also a metamorphmagus? Harry becomes a Puff and has to resist Dumbledore's machinations and learn what it means to be a member of the Hufflepuff house. this story is adopted from Ironicism. The first three chapters are all his/her work I don't have any credit for the first three chapters.