In this fanfiction, Albus Severus might seek advice from Snape's portrait. Maybe Snape's portrait would offer him some wisdom about facing the challenges at Hogwarts, like dealing with the pressure of his name and family legacy.
Snape's reaction would be complex. He has so much history with the Potter family. At the start, he might show his usual cold exterior. However, if Albus shows respect and a genuine desire to learn from him, Snape could gradually warm up. He might share some of his potions knowledge and secrets that he never shared with others. He may also tell Albus stories about his mother, Lily, in a roundabout way, to help Albus understand his family's past better and the sacrifices that were made for him to be alive.
In some cases, the relationship is slow - building. Albus Severus, being a curious and empathetic character, tries to break through Snape's barriers. He might start conversations about potions or magic in general. Snape, initially dismissive, gradually warms up as he realizes Albus Severus is not like the other students. Their relationship could then evolve into a sort of mentorship, with Snape teaching Albus Severus things he never learned in the normal Hogwarts curriculum, and Albus Severus showing Snape that there are still good things to come in the future.
One interesting story could be where Albus Severus discovers Snape's hidden kindness through a time - travel accident. He gets to see Snape's past and the sacrifices he made, which changes his perception of him.
Perhaps Snape could help Albus Severus come to terms with his family legacy. Albus Severus is named after two great wizards, Albus Dumbledore and Severus Snape. Snape could share his own experiences of being in the shadow of great names and how to carve out one's own identity in the wizarding world. This encounter could be a very emotional and character - building moment for Albus Severus.
Well, Albus could finally understand Snape's true nature. Maybe he discovers the sacrifices Snape made for his family. He might apologize for any wrong assumptions he had about Snape in the past.
It might be a rather complex relationship. Snape has his own dark past and Albus Severus has the weight of his family name. They could start off on the wrong foot, with misunderstandings, but gradually develop respect for each other as they get to know one another better. For example, Snape might initially misjudge Albus Severus as being just another spoiled Potter, but then realize his determination and intelligence.
A fanfiction could be about Snape's unspoken loyalty to Dumbledore. Despite their differences and the difficult tasks Dumbledore assigned him, Snape remained faithful. This could be explored through Snape's thoughts and internal monologues, showing his deep - seated respect for Dumbledore.
The portrait could be more open and less guarded. While the real Snape was often secretive and brooding, the portrait could be more forthcoming with his feelings. For example, he might openly express his pride in the students he once taught, especially those who have gone on to do great things in the wizarding world.