Maybe there's a magical spell gone wrong that links their fates to the Panthers. So they have to work together to figure out how to break the spell. Along the way, they realize they both have a deep passion for the team. They start to respect each other more as they deal with the magical and Muggle aspects related to the Panthers.
One plot idea could be that they use magic to transport themselves to Panthers games and have to keep it a secret from the wizarding world. Another could be that they meet other Panther fans in the wizarding world and form a secret fan club.
Well, one possible plot could be that they all inherit season tickets to the Panthers from some wizarding family member. Harry is excited because he's never really been into a Muggle sport like this before. Draco is initially snobbish about it but then gets really into the team spirit. Snape, on the other hand, is only interested in the strategy aspect of the game. And throughout the story, their different perspectives on being Panthers fans cause some clashes and also some unexpected friendships to form.
Perhaps in this fanfiction, Harry is actually a pet in a magical, alternate reality where Severus is a powerful wizard with a penchant for collecting unique magical creatures. Harry, in his pet form, might hold some sort of special power or significance that Severus is eager to uncover. This could lead to adventures as Severus tries to unlock the secrets within Harry while also keeping him safe from other dark wizards who might want to steal Harry for their own purposes.
One possibility is that Harry discovers some dark secret about Severus that makes him feel he can no longer stay in the same place as him. For example, if he finds out Severus had a hand in some past event that endangered his friends. So he decides to leave to protect himself and those he cares about.
One interesting fanfic could be 'Panthers' Pride'. In it, Harry and Severus' shared love for the Panthers leads to some unexpected alliances. They end up using their passion for the team as a way to bridge their differences in the wizarding world. For example, they might meet at a local pub in the Muggle world to watch a Panthers game and gradually start to understand each other better.
Perhaps in the fanfiction, a powerful magical artifact forces Harry and Severus to conceive a baby as part of a prophecy. They initially resist but gradually come to accept it. The plot might involve their journey to protect the baby from dark forces who want to use the baby's unique heritage for evil purposes. They have to put aside their differences and work together as parents.
Perhaps in the fanfiction, Draco and Severus leave Harry because they are forced to by some external dark force. This could lead to Harry having to face new challenges alone, while Draco and Severus struggle against this force in their own way. They could end up being spies or trying to find a way to defeat the dark power from afar.
In this fanfiction, Severus might adopt Harry to protect him from the dark forces that are still lurking around. He would use his knowledge of the dark arts and potions to keep Harry safe. He could also introduce Harry to a different side of the wizarding world, one that is more about academic study and self - discovery. For example, he may encourage Harry to study advanced potions at a very young age, which would give Harry an edge in his future magical education.
A possible plot could be that Voldemort has a change of heart (maybe due to some ancient magic or prophecy) and realizes he needs Harry and Severus. Harry, on the other hand, sees an opportunity to end the cycle of violence. Severus, with his knowledge of both dark and light magic, helps them understand each other. They could then embark on a journey to unite the wizarding world, facing challenges like the resistance from the Death Eaters who don't want Voldemort to change, and the mistrust from the Order of the Phoenix who are skeptical of Harry's new alliance. Along the way, they also discover new magical abilities within themselves and each other, which helps them in their quest.
The plot might start with Harry having strange dreams or feelings that lead him to realize his connection to Lucius and Severus. As they come together, they find that they have to hide their relationship from the Death Eaters (in Lucius' case) and Dumbledore's side (initially, as it's so unexpected). They could also be on a quest to find out the origin of this bond, which might be related to some ancient magic. During this journey, they learn about each other's pasts, like Severus' love for Harry's mother and Lucius' family history, and how it all ties into their present relationship.