Harry decides to learn from Sirius the summer after he meets him and learns everything about magic and Animagi. As the year progresses, he finds that being an Animagus is not as appealing as it seems to be... it's better than that.

A self insert that makes Spidey a bit more badass and better, in an amalgam universe, and doesn't shy away from killing people. For those who saw the major mess up in the formatting, I fixed it, there are no weird stuff laying around.