Summary:

Tony died a heroic death and would have been worthy to know Cosmic Peace, but his Ties to others were so taut that he was about to become a specter, eventually Haunting those whom he loved more than anything.

So a Powerful Being replaced him in Time (and space), forcing him to live Another life for 20 years if he ever wanted to see the Avengers again. This is how Tony Stark became a Wizard in Hogwarts.

(See tags for ships and more!)