Perhaps Harry has been wrongly accused of something major at Hogwarts. He feels extremely frustrated and alone. Snape, who may have some knowledge that Harry is innocent, lets Harry cry on his lap as a way to console him without openly showing his support in front of others. It could be a moment of unexpected connection between the two characters.
One possibility could be that Harry has faced some extreme danger or a great loss in the wizarding world. Maybe he lost a close friend in a battle, and Snape, despite their past differences, offers him a moment of comfort. Snape, in this scenario, might be showing a side of himself that Harry has never seen before, a more empathetic side.
It could improve their relationship significantly. This moment of vulnerability from Harry and acceptance from Snape could break down some of the long - held animosity between them. They might start to see each other in a new light and become more understanding of each other's actions in the future.
Well, it could be a rather strange plot. Maybe it's a situation where Harry is injured and Snape has to hold him in this way for some kind of magical healing process. Harry might be in a weakened state and Snape, despite their past differences, has to take care of him. This could lead to an unexpected moment of understanding between them.
One possible plot could be a moment of unexpected connection. Maybe Harry is injured during a battle and Snape, in a rare moment of vulnerability, tends to his wounds. As Harry recovers, he impulsively shows his gratitude with a kiss on Snape's lap, which startles both of them and sets off a series of complex emotions and a new dynamic in their relationship.
One possible plot could be that Harry accidentally falls onto Snape's lap during a chaotic Potions class. Snape is initially angry but then realizes Harry is hurt. So, instead of scolding him, he helps Harry get better while Harry is still on his lap in a rather awkward but kind moment. This would show a different side of Snape and a new dynamic between them.
Maybe Harry is crying because he misses his parents. He often feels the pain of their absence deeply, and in this fanfic, when Sirius sees him, that could be the cause.
In the fanfic, Harry could be a professor of Muggle Studies. He'd introduce the wizarding students to the amazing and diverse Muggle world. He could talk about Muggle technology, like how cars work or what the Internet is. His own experiences growing up in the Muggle world would give him a unique perspective to teach this subject.
In this fanfiction, there could be a dark force threatening both the wizarding world and the Teletubbies' world. Professor Snape, with his knowledge of dark magic, teams up with the Teletubbies. The Teletubbies have some sort of special power that is related to their connection with nature. Snape has to figure out how to combine his magic with their power to defeat the common enemy. Along the way, Snape's cold exterior starts to thaw as he gets to know the Teletubbies better and they start to respect his skills and wisdom.
It could be about a student who is being protected by Professor Snape from some dark forces in Hogwarts. Maybe the student has some special power or knowledge that makes them a target, and Snape uses his skills and influence to keep them safe.
A possible theme could be forgiveness. Harry might be in a position where he has to forgive Snape for all his past misdeeds. And this rather strange act of Snape bouncing him on his lap could be a catalyst for that forgiveness. Additionally, it could also touch on the theme of growth and change, both for Snape, who is showing a different side of himself, and for Harry, who has to adapt to this new side of Snape.
One possible plot could be that they discover they are brothers early on in Harry's time at Hogwarts. Snape then has to balance his duties as a teacher and his newfound family connection. He tries to protect Harry in secret from the threats within the school, like Malfoy and his cronies.