Revenge - AU - HBP didn't count - Harry felt betrayed by the Order and Snape (in the first place), he wants his revenge, and he wants to teach Snape who is the boss. One night after Severus came back from Voldemort. Harry use his weaken state and attack him.

AU - HBP didn't count - Harry feel depress, he start to separate himself from everyone else (his friend, the Order). Severus was found out to be a spy on Voldemort. So he need to hide. Dumbledor (AD) have an idea to put up Severus to the task to bring back Harry to the life/from his depression. 

• Severus is a vampire, and AD put on him a glamour (he look about 17 or less) and send him to Private Drive to be the new neighbour. To try to be a friend with Harry.

• Or Severus will be de-aged so he can go to school like a student and that way to try to befriend with Harry.  

• AD hide him like a student in Hogwarts. The new boy caught Harry's attention. And one night when Harry out of the Gryffindor dorm. He saw AD and Severus arguing and follow them. Severus is a magical creature (your chose: veela, incubus…) and once a month he is in heat until he found his mate or someone calm him as his owner/master. Harry snake in the room where AD close Severus once a month. He didn't know what would happen and hide there. AD close the door to open next morning. The other happening is up to you. I love if Sev is submissive.

• OR AD hide him like a student in Hogwarts. The Weasley twins found out his true identity. They have a crush on Snape some times ago and now it's the best time to try to court him. (one or both of them your chose).

Harry has a vision where he saw Voldemort and Snape. In his vision he is Voldemort and feels his every feeling. And Voldemort obsession is stay with him after his awaking.

SS/LM/RL - a love triangle/treesom - Severus is a submissive partner. Lucius is on the good side. The war with Voldemort is over or before his first rise. Lucius as a veela search after his mate, as Remus his own. They found him almost the same time. Which one will win over Severus hart? Lucius. Remus. Neither or Both. 

Voldemort hope to find a way to reestablish his old power that was lost when Potter destroyed his first body. He use an old Dark Ritual and call back to life his most powerful ancestor, Salazar Slytherin to use his blood and gain back his power. Voldemort give a gift to Salazar. One of his minions, Severus Snape (de-aged or not is up to you). How will Slytherin react? How will he use Voldemort's gift? What will be Salazar opinion from his offspring and his cause?

Salazar Slytherin was a famous Potion Master in his own time. One day he just disparate from Hogwarts' dungeon.

• One day in the Marauders' time, Slytherin apparate in the dungeon. And meet a dark Slytherin boy, Severus Snape.  How will it change the future?

• OR When Harry Potter at school, and meet the mysterious Severus Snape, Head of Slytherin. How will AD hide the present of Salazar from Voldemort? How will Salazar react of Voldemort and his cause? 

Severus found a way to rescue Sirius from the Veil

• AD bid Severus to rescue Sirius and keep Sirius out of the sight until he reestablishes his power and health.

• OR Despite Albus bid, Severus rescue him and hide him in the dungeon or in the muggli world.

• OR Despite Albus bid, Severus with Harry's help rescue Sirius and they hide in the muggli world from Voldemort and AD as well. 

AU - HPB didn't count - After the war, the ministry think Harry Potter is dangerous and closed him in Azkaban. (You can decide if the wizarding world know of it or not)

• Severus goes to Azkaban to rescue Lucius, (here better if the wizarding world didn't know where Harry disapparet.) and found the Potter boy there. So he rescue him as well. (Pairing is you choose: SS/LM/HP or SS/HP oe SS/LM and DM/HP)

• OR Severus goes to Azkaban to rescue Harry. He hides Harry in Hogwarts' dungeon. Severus helps Harry to be what he means to be, with potions he help his growing. 

Severus was de-aged when a potion accident happens. AD ask the Weasley twins to help out for Severus with his class. The twins have a crush on Severus or develop one. And try to get Severus attention.

 Ron or Neville misspell a course and its hit Severus

• It cause him to  became pregnant from the spell caster

• OR From his soulmate

• OR From the first person who touch his skin

• OR From the first person with whom he have sex 

Its always hard to serve two Master but what if both of them wants the same think. To distract Harry from his studying. And both of them thought the same person, Severus Snape. Severus know only one thing what can distract a teenager boy (by age student). But he didn't know what surprise he will get from this.

After the 2. Voldemort War Harry Potter lost his memories in a Quidich accident, he forget everything what happened after his 5 or 6 year. Including his life with Severus Snape. (More them one child required). 

AU - HPB didn't count - The Order's headquarter under attack. AD bid to evacuate the base. They escape with floo to the Vampire Prince's Castle. Where they meet Severus (he as well a vampire or a half its up to you)

SS/RL - Its full moon Remus turn into werewolf. In same way Severus meet him but the werewolf didn't kill him only mate with him.

• In school, James didn't reach them in time or didn't get word what will happen. Moony recognize Severus as his mate and turn him werewolf as well. Remus maybe didn't remember what he did or Remus is in love with Sirius and didn't want to lose him so in human form he didn't acknowledge him. So Severus stay alone with his burden. (Beta werewolf as Sev can bear there mate's children)

• OR In the war (the first rise or second of Voldemort is up to you) Remus was captured by Death Eaters (DE). They use him as an executor of the traitor. 

To save a life of his ex-student Severus need to take over his role at the last minuet. (one of the Golden Trio) The Dark Lord didn’t want him/her died only in misery and shame. Voldemort himself or one of his minions rapes the victim. Maybe use a potion to like what happening to him/her. So he can't tell that later any authority he didn't like it. Or a pregnancy potion.

In a Potion class one of the student cause an explosion. One or two student (Harry or/and Draco) was affected. Severus tries to save them (maybe he is affected as well). It's a de-aging potion. They start to de-aged and the student(s) then they disaparate. Later Madam Pomfrey finds out they just regress to embryos and now they are in Snape's body. They may or may not have him as 3. parent.

Harry Potter disaparate and sometimes later he seek out Voldemort and offer an alliance with Voldemort if he get something for it. He wants only one think for exchange the traitor Severus Snape as his slave.

After the war every Death Eater was sold as a slave. Harry wants his revenge on Snape and Draco. So he buy them. - Severus made with him a deal. If he allow Draco to have a second childhood or let him go (your choose) he will do anything Harry want without fighting with him.

Voldemort reward Severus (for killing AD) and made him his lover (maybe his offspring's mother).

Severus Snape relationship with Harry Potter, 7th year student (Severus is the sub) went wrong when AD found out. AD banish Severus from Hogwarts.

•  Without Harry know what happened with his lover. Voldemort finds out Snape is with Potter's child and captures Severus and keep him as his slave. And wait for the child's birth. Before or after that Potter (now out of school) go after Voldemort. Maybe find Severus and his child in time. But will he know it's his child?

• OR Severus leave the wizarding world as an ex-death eater no-one will give him work. He maybe later will find out he is pregnant. But Harry didn't want to hear from him.(your choose why) Where will Sev find a job? In the muggli world or in the dark side of the wizarding world?

After the werewolf incident Severus runaway from Hogwarts. With no family where to run back. He hides in the muggli world. One of the dark bar a muggli give him a work. He became a whore or a striper. Someone find him there after sometime.

•  James and Sirius want to have a fan and venture out in the muggli bar.

• OR Lucius always looked at the dark hair boy as a brother. One of the DE ride he find the runaway boy in an unexpected place.

• as a student (which year is your choose). He will be a Slytherin and became a victim one of the infamous marauder prank. Next day he wake naked beside Severus.

• OR as a student (which year is your choose). And one night when Harry out of the dorm. He saw AD and Severus arguing and follow them. Severus is a magical creature (your chose: veela, incubus…) and once a month he is in heat until he found his mate or someone calm him as his owner/master. Harry snake in the room where AD close Severus once a month. He didn't know what would happen and hide there. AD close the door to open next morning. The other happening is up to you. I love if Sev is submissive. 

• OR as a 20 year old (or more) he will be the new DADA teacher and became a victim one of the infamous marauder prank. Next day he wake naked beside Severus. (which year the Marauders are is your choose)

• OR as a 20 year old (or more) he will be the new DADA teacher and find Severus when the boy hurt/depress.