Darth Vader as Severus Snape

Rewrite of my other Fanfic: "What would you do if you were Severus Snape in his time at Hogwarts" What if 16 year old Severus Snape had been influenced by more than the dark arts and the loss of Lily. If Severus had been reached by a being from a galaxy far, far away. What if Anakin Skywalker or rather, Darth Vader had died when he was left burning by Obi-Wan.