Snape in Time
The werewolf incident at the beginning of Snapes fifth year went south, James Potter never showed to save him. He did manage to get out of the shrieking shack, but ended up getting turned around and ran into the forest instead of towards the castle. He felt lupin gaining on him until he was blinded by a bright white light, only to wake to a unicorn nudging him awake. Confused, he stumbled his way up to the castle, but couldn't get into the common room. He went to slugghorns office to ask for the changes password, and report lupin and black for the bs they just pulled, not that he believed anything would be done about it. When the door opened though, he was greeted by his father, or at least what he at first thought was his father. Turns out it was his older self.
Interdimensional time travel. Young Snape was pulled into this universe when this worlds HP's accidental magic stopped Lupin from attacking her by sort of curing his lycanthropy.
HP is fem and name is Azalea (temperance and prudence.) Lea Potter to the Wixen world, but Izzy to her friends. Middle name Beatrix after a great aunt (Meaning:voyager (through life); blessed.
Displaced Snape takes the name of Ivaylo (Bulgarian name meaning wolf) Prince, and is sort of adopted by his older self, who he decides he very much does Not want to become.
He becomes friends with Izzy, and is quite pissed about how his older self treats the daughter of their best friend, even if she is also Potters spawn.