Snape's view of Harry might become more sympathetic. He would see Harry as a victim rather than just an annoying student. This could lead to a softening of his attitude towards Harry in general.
His view would likely change drastically. Instead of seeing Harry as a source of irritation or a rival, he would see him as someone who has been wronged and needs protection. This could make Snape more protective and less critical of Harry.
Well, Snape is a complex character. If he discovers that Harry was raoed in a romance fanfiction, he would probably be filled with a mixture of emotions. First, there would be disgust at the very idea of such a thing happening to Harry. Then, he might feel some guilt, as if he should have been able to prevent this (even though it's in a fictional scenario). He would most likely want to confront the person responsible for writing it, and he would also be more vigilant about Harry's well - being. He might even start to see Harry in a new light, with a deeper understanding of the potential vulnerability that Harry could have.
Snape's view of Harry would likely become more complex. He might see Harry as more vulnerable than he previously thought. His initial disdain might turn into a sort of begrudging concern. He would realize that Harry is dealing with deeper issues than just being the 'Boy Who Lived'.
In the fanfiction world, Snape might be initially shocked. He has a complex relationship with Harry. He could feel a sense of protectiveness that he rarely shows openly. He might use his skills and knowledge to find the perpetrator and seek justice for Harry.
Snape's view of Harry would likely soften. He would see that Harry has a difficult home life, which could make him more sympathetic towards Harry. He might stop being so harsh in his treatment of Harry at Hogwarts.
Snape would be deeply shocked and disgusted. Given his own experiences and the values he holds, finding Harry in a rape - related romance fanfiction would be like a blow to his perception of the world around Harry. He may initially be in disbelief, but then his anger would rise. He might try to find out who created such a disturbing fanfiction and perhaps try to put an end to it, as it goes against everything he believes in and the world he is a part of in the original Harry Potter series.
His life would become more complex. He would have a new family bond to consider. He'd likely be more protective and might start to think about his future in terms of his sister as well.
Well, at first Harry might be very suspicious. But as Snape shows consistent care, Harry could start to see him in a new light. Maybe he realizes that Snape has more layers than he thought. He might begin to understand that Snape's past actions were more complex than just being mean to him.
The relationship would become more complex. Snape would have a certain level of control over Harry as his familiar. This would force Snape to be more responsible for Harry's well - being. Harry, in turn, would have to rely on Snape in a new way.
The relationship would become extremely strained. Harry would likely go from having some level of respect or at least tolerance for Snape to feeling intense hatred. He might avoid Snape at all costs and even start to plot revenge in his head.
His view of the universe would expand greatly. He'd realize there are more things out there than just the wizarding world and the Muggle world.