1. When Severus Snape dies in the Shrieking Shack, he is met in the afterlife by an old man who claims to be Merlin. Merlin tells him that he’s been waiting for his arrival for a very long time and then he hands him his staff. Severus awakes on the floor of the Shrieking Shack with the staff of Merlin in his hand. He is completely healed and the power of the staff courses through his body. He heads into the middle of the raging battle that’s not going very well for the side of light, but with one blast from the staff, Voldemort falls dead at Severus’ feet. Severus Snape is now the most powerful wizard in all the magical world. Harry is in awe of Severus and they fall in love. Bonus points if Harry gets pregnant.
2. Post War: Harry is depressed and pines for his lost Godfather. Severus survived the war and is hopelessly in love with Harry. He knows the only thing that will make the boy happy is to be reunited with his Godfather. What lengths will Severus go to in order to bring back his most hated enemy? Sirius is retrieved from behind the veil, but something has gone wrong. He is changed somehow, (bonus if Sirius is dark and dangerous) and now Severus must rescue his beloved Harry from the clutches of his deranged Godfather.
3. In a last ditch effort, Harry tries an obscure spell that he got from Hermione to revive Remus Lupin. The spell works, but Remus immediately turns into Moony. Confused and frightened, Moony bites Harry and he is turned into a werewolf. Now Severus must find both of them and administer the Wolfsbane Potion. Bonus if they all fall in love and form a threesome/pack. Babies welcome.
4. Dumbledor is evil and he has the wicked queens magic mirror. Everyday he asks the mirror who is the most powerful wizard of all and everyday the mirror answers Severus Snape. Dumbledor is enraged and plots Severus’ demise. The golden trio stumble onto his nefarious plan and attempt to save Snape. (A play on Snow White.) Pre-slash because Harry will be underage.