Often, in fanfictions, Ron's loyalty to his friends and Snape's knowledge of the Dark Arts create an interesting dynamic. Snape may be reluctantly impressed by Ron's courage, which is something he secretly admires in Gryffindors. And Ron might come to realize that Snape is more than just the mean professor he thought he was. There are also fanfictions where they are paired up for a difficult class project, and through that, they start to understand each other better.
They could interact in a mentor - mentee kind of way in certain fanfictions. Snape, with his vast knowledge of potions and the Dark Arts, could end up teaching Ginny something valuable. This would require them to have conversations and work together, which would be an interesting dynamic considering their different houses and personalities.
In many fanfictions, their interaction starts with suspicion. Snape is a very guarded character, and a female Harry Potter would be an unexpected presence. So, at first, he might be cold and distant.
In many of these fanfictions, the relationship often starts with a moment of realization for Snape. For example, he might notice Hermione's intelligence in a new light during a difficult class situation or a dangerous encounter in the wizarding world. This initial spark then leads to him observing her more closely, which in turn catches Hermione's attention.
One common theme could be the exploration of an unlikely relationship. Since Snape and Ron have very different personalities in the original story, fanfiction might focus on how they overcome their differences. Another theme could be the power dynamic, as Snape is a teacher and Ron is a student, which can add an interesting layer to the relationship in the fanfic.
One common theme is redemption. Snape is often portrayed as a character in need of redemption in these fics, and Ron can be the catalyst for that change. For example, Ron might see past Snape's harsh exterior and actions in the original series and help him become a better person.
In many of these fanfictions, Snape is often portrayed as a complex and misunderstood figure. He is shown as having a deep - seated sense of loyalty, whether it's to Hogwarts or to the memory of Lily. For example, in some stories, he acts as a sort of guiding spirit for Albus Severus, using his past experiences to help the young Potter navigate the challenges at school.
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.
I'm not really into that particular slash fanfiction myself, but you can try searching on fanfiction.net or Archive of Our Own (AO3). They have a vast collection of Harry Potter - related fanfictions, and you might be able to find some Severus Snape and Ron Weasley ones there.
One great Severus Snape and Ron Weasley fanfiction is 'The Unlikely Bond'. In this story, Snape and Ron are forced to work together on a dangerous mission in the Forbidden Forest. It shows how their initial animosity slowly turns into respect as they face various magical creatures and dark magic threats. Another interesting one is 'Snape's Surprising Ally'. Here, Ron discovers a side of Snape that no one else has seen when he stumbles upon Snape's secret research. This leads to a series of events where they have to rely on each other.
There are also fanfictions where they are magically bonded in some way. This bond makes them feel each other's emotions and forces them to deal with their relationship on a much deeper level. They have to learn to tolerate and eventually accept each other, which leads to a very different kind of relationship compared to what we saw in the original Harry Potter books.