Choice of side effects(harry potter)

Rather than having you choose the story to take place in areas such as a TV show, movie and what not/ You can add your story lines as you wish.

Lets start with the scenarios I gave in the description.

In the Universe of Harry Potter it has long been known that all Magicals who were Pureblooded Witches would be born with massive breast and asses, while Wizards were born with cock no longer than maybe four inches erect. A Halfblood could either take after their Muggle or Magical parent so could either be stacked/tiny or "hung" In this world all Muggles such as Harry's Uncle and Cousin are considered small if their cocks are a foot long.