Another plot could be that Snape discovers a long - forgotten prophecy that gives him the key to Voldemort's destruction. He spends a great deal of time researching and deciphering it. Eventually, he realizes that he has to sacrifice something dear to him, like his own magical powers, in a unique way to be able to kill Voldemort. He makes this sacrifice willingly in a final showdown with Voldemort and manages to end his life.
In some fanfictions, Snape might have a secret alliance with other powerful wizards or witches. They work together in secrecy to find a way to defeat Voldemort. Snape could use his double - agent status to mislead Voldemort into a trap. For example, he could tell Voldemort false information about a powerful weapon that Voldemort wants, and when Voldemort comes to claim it, they are all waiting to ambush him and Snape delivers the final blow.
One possible plotline could be that Snape discovers a hidden weakness of Voldemort. Maybe through his years of spying, he finds out that a certain spell, when combined with an ancient magic artifact, can destroy Voldemort. So he devises a plan to get hold of the artifact and uses the spell at a crucial moment when Voldemort is off - guard, perhaps during a major battle when Voldemort is focused on other opponents.
In some fanfictions, Snape might be working with Voldemort because he has been blackmailed. Voldemort could have found out some deep, dark secret about Snape and is forcing him to cooperate. This could be related to Snape's past or something he has done that he doesn't want to be made public.
Power. Voldemort might see Snape as a means to gain more power. Snape is highly intelligent and skilled in the Dark Arts. By caring for him, Voldemort could be ensuring that Snape remains loyal and continues to use his skills for Voldemort's benefit.
There could be a plot where Snape's muteness is a secret that he tries to hide from everyone at Hogwarts. The story could be about how he manages to teach Potions and be a double agent for Dumbledore all while keeping this secret. Or perhaps a plot where his muteness is a magical experiment gone wrong, and the story is about his journey to reverse it. Along the way, he might discover new aspects of magic and his own identity that he never knew before.
A possible plotline could be centered around Severus seeking help from unexpected sources. Maybe he turns to some of the more neutral or even good - aligned wizards and witches for advice or assistance, since he can't rely on Voldemort or the Death Eaters completely. The pregnancy could also be a catalyst for Severus to re - evaluate his life and his actions. He might start to question his past decisions and try to find a way to create a better future for himself and the unborn child, all while dealing with the stigma and danger associated with such a situation in the wizarding world which is full of secrets and power struggles.
One possible plotline could be that Snape discovers a hidden vulnerability in Voldemort. Maybe it's related to his Horcruxes. Snape, being the intelligent and resourceful character he is, figures out a way to destroy all of Voldemort's Horcruxes without Voldemort suspecting. Then, he uses his powerful magic skills, perhaps a combination of dark and light magic, to directly confront and kill Voldemort.
One possible plotline could be that Severus Snape discovers he has royal blood. He then has to navigate the complex world of royalty while still dealing with his duties at Hogwarts. Maybe he uses his new - found status to gain more influence in the wizarding world, but also has to face those who are jealous or suspicious of his sudden rise.
One possible plotline could be that Snape remains a loyal Death Eater throughout. He continues to carry out Voldemort's orders without question. Maybe he helps Voldemort in his search for more powerful dark magic, and in this version, he has no hidden motives of protecting Harry or the Order. He is fully committed to the Dark Lord's cause, which could lead to a much darker and more hopeless situation for the wizarding world.
One possible plotline could be that Harry breaks a major Hogwarts rule, like sneaking into the Forbidden Forest. Snape catches him and decides that a severe punishment is in order, which in this case is spanking. Another could be that Harry fails a very important Potions test repeatedly, and Snape, frustrated with his lack of progress, resorts to this extreme form of discipline. However, these are all just fan - created ideas and not part of the official story.
There could also be a plotline where Hermione discovers some of Snape's past traumas and in trying to help him, they form a bond. Snape, out of gratitude and a newfound respect for her, starts to take care of her like a mentor. He shields her from the harsh judgments of other Hogwarts professors and students alike, and together they work towards a better future for the wizarding world.
Well, a plotline might involve Snape initially being in denial about the pregnancy. As it progresses, he could start to form an unexpected bond with the unborn child. There could also be a plot where other characters find out and either support him or try to use it against him. Maybe Voldemort discovers it and tries to manipulate Snape in a new way because of this situation.