Some fanfictions show Harry and Snape having very tense interactions. Even though the war is over, the years of hatred and misunderstanding don't just disappear overnight. Snape might still be sharp - tongued with Harry, and Harry might be on edge around Snape.
There are also fanfictions where Harry and Snape end up working together on something. Maybe they are both involved in the rebuilding of Hogwarts or in reforming the wizarding world's laws. This forces them to interact on a regular basis and over time, they develop a new kind of relationship that is based on mutual goals and a shared sense of responsibility for the future of the wizarding community.
In other fanfictions, there could be a sort of redemption arc for Snape in Harry's eyes. Harry could start to see Snape as a tragic hero. He might approach Snape to learn more about his mother, Lily. Their interactions would then be more of a sharing of memories and stories related to Lily, which would be a very emotional and complex process.
Often as a complex figure. He's still the reserved and somewhat prickly man we know, but in the context of marriage, his softer side might start to show. For example, he may be more protective of his partner.
Often, fanfictions show a very strained relationship between them. Given Tobias's likely abuse of Severus in the original story, many fanfictions expand on Severus's internal struggle with his father. For instance, Severus might be constantly haunted by memories of his father's drunken rages.
Some fanfictions might show that when Harry Potter is around Lavender Brown, there's a sort of 'lemon - like' awkwardness. For example, every time they meet, it's as if there's a sour smell in the air (metaphorically), representing the uneasiness between them.
A positive interaction could be Snape recognizing Hermione's exceptional intelligence and giving her special tasks or projects. This not only helps Hermione grow in her magical abilities but also gives Snape a sense of pride in mentoring such a bright student. They could also have discussions about the history of magic, with Snape providing insights from his own experiences and Hermione contributing her fresh perspectives.
Some fanfictions might do this out of a desire for shock value. They want to create a controversial and extreme version of the character to get more attention.
One reason is the complex relationship between Snape and Harry in the original Harry Potter series. Writers are intrigued by this relationship and use the idea of Snape pinning something on Harry as a way to explore it further. It could be a symbol of protection, a sign of a hidden connection, or a device for plot development.
In some fanfictions, Snape might save Harry from a dangerous situation. For instance, if there's a new dark wizard threat in Hogwarts, Snape could use his skills and knowledge to protect Harry. This would show a positive side of their relationship as Snape is putting Harry's safety first.
In these fanfictions, Snape might ignore Harry because of his past with Harry's father. James Potter bullied Snape when they were at school, so Snape could be projecting that hatred onto Harry. It's a simple yet powerful motivation for his behavior.
Fans often portray their relationship as starting off very rocky. Snape is still the brooding, somewhat bitter character, and Harry is initially very suspicious of Snape's intentions regarding his pregnancy. But as the story progresses, they start to rely on each other more. Snape uses his knowledge to protect Harry and the unborn child, and Harry begins to see Snape in a new light.
They often show him as a deeply conflicted and damaged individual. His past experiences, like his difficult childhood and the complex relationships in his life, are used to explain his tortured state. For example, his unrequited love for Lily might be explored in more depth, and how that has tortured him over the years.