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Severitus 

A fanfiction story challenge made by the author Severitus on fanfiction.net. It includes a very specific set of requirements, found at their LiveJournal page (google "severitus challenge livejournal").

Requirements:
1. Severus Snape must be revealed to be Harry's father.
2. Remus Lupin must have returned to Hogwarts for some reason or another (unless it's a 3rd year AU, in which case he's already there).
3. Harry must undergo some progressive physical change starting on his birthday. No *tada!* and suddenly he looks like Snape.
4. The story must be based mostly around Harry and Snape.
5. (Optional) Incorporate one or more of the conversations posted on the LiveJournal page. Change them however you want (it's encouraged!).
6. Make a note somewhere that it's in response to this challenge, so all the other nice people can give it a shot too, and be able to find the other challenge responses.
7. Tell Severitus that you wrote a response to the challenge! Feel free to either email them or let them know in a review on one of their stories.
I was reading a fic tagged as a Severitus, but the author didn't include all of the requirements of the challenge. They probably assumed that "Severitus" was just a fancy name for a "Mentor!Snape" fic, and never read the challenge themselves.
Severitus by Danneyland October 4, 2016

severitus 

A challenge made by the fanfiction author Severitus. It is mainly about Snape being Harry's father. However unlike Sevitus, in Severitus Remus Lupin must have returned to Hogwarts for a reason, Harry must undergo some physical change on his birthday and of course, the fanfic must be Harry and Snape-centric.
The author Severitus really loves the idea of Snape being Harry's father, doesn't he?
severitus by Inoue Ayumi December 8, 2009

Severus Snape 

n. An ambiguous character in the Harry Potter series. He teaches the Potions class, speaks mostly in a whisper and snarls a lot.

In the books, he is a thin, spider-like man with a large hooked nose and greasy black shoulder-length hair. He wears billowing black robes and pretty much dislikes everyone.

In the movies, he is Alan Rickman in a non-wizardy but completely adorable outfit.
Fangirl: Aaaahhhhh! Cuteness!
Snape: Silence!
Fangirl: Sevvie-cakes!
Snape: DO NOT CALL ME THAT!
Severus Snape by Kalondo January 1, 2005

severus snape 

A Potions professor at Hogwarts school in the Harry Potter series.

Snape is generally described as hook-nosed, greasy-haired, pale and thin. His demeanor towards Harry Potter is closest to loathing, for reasons unbeknownst to Harry, until the 7th Harry Potter book. In the final installment, Harry discovers that Snape loved his mother Lily. Snape also despised Harry's father, James, perhaps because of jealousy.

Although Snape hates Harry due to Harry's resemblance of James Potter, he sees his own love's eyes in Harry. Snape is largely responsible for saving Harry's life throughout his school career by working as a double agent for Dumbledore. His death is quick and without glory, but Harry spreads the knowledge of Snape's bravery in the years after his death.
Insert a beautiful doe Patronus, the same Patronus as his unrequited love's, Lily Evans, performed by Snape.

Dumbledore,with tears in his eyes: All this time?
Severus Snape: Always.
severus snape by kalikula August 5, 2007

a real Severus Snape

(noun) a person who is very difficult to put your finger on; he/she often displays seemingly contradictory behavior which make said person's motives very difficult to decipher
John's always hitting on girls, but whenever they flirt back he gets all offended and says he has a girlfriend. That SOB's a real Severus Snape.

Severus Snape 

The greasy haired, hook nosed potions master in Harry Potter that "loathes"...mostly everything. Mysterious, and has a haunting past. Was a death eater, but turned spy for Dumbledore and the Order Of the Pheonix.

In the sixth book, Snape murders Dumbledore.

In the seventh book, Snape shows Harry why he did it. Turns out he loved Harry's mother, Lily, and turned to Dumbledore for help when he found out Voldemort was going to kill her (and her son and husband). When Dumbledore has one year left to live he asks Snape to kill him in order to help others.
Dumbledore: But this is touching Severus, have you grown to care for the boy, after all?
Severus Snape: For him? Expecto Patronum!
(A silver doe patronus like Lily Potter's emits from Snape's wand.)
Dumbledore: After all this time?
Snape: Always

Lily Potter: Does it make a difference, being Muggleborn?
Snape hesistated. His black eyes, eager in the greenish gloom moved over the pale face, the dark red hair.
Snape: No, It doesn't make any difference.
Severus Snape by goddessgurl2012 October 5, 2007
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