Maybe Albus has done something dangerous or disobeyed Harry's instructions. For example, if Albus got involved with some dark magic related stuff without Harry's knowledge, that would surely make Harry yell at him.
One reason could be the exploration of alternative storylines. Fans like to see what would happen if a character like Albus Potter, who is from a well - known family in the Harry Potter universe, was disowned. It adds a new layer of drama and character development.
Most likely, his parents, Harry and Ginny Potter, could send the howler. They would be concerned about their son's well - being and actions at Hogwarts. If Albus got into trouble or was not living up to the Potter family name, they would not hesitate to send a howler to set him straight.
There could be a fanfiction where Albus Severus Potter gets transported back in time to the era of his father's youth. He could witness the events that Harry went through first - hand, but also accidentally change some small things that have big consequences for the present time. He then has to find a way to fix the timeline without completely erasing his own existence.
Well, in many Harry Potter fanfics about Albus Potter in RADS (I assume it means something like the Ravenclaw, Gryffindor, Hufflepuff, Slytherin system), Albus often faces unique challenges. He might be under a lot of pressure because of his famous father, Harry Potter. In some fanfics, he struggles to find his own identity within the school's sorting system and among his peers. He could be trying to prove that he's not just living in his father's shadow.
In fanfiction, Albus Severus Potter often embarks on various adventures. When it comes to the mention of 'lemon' in relation to him, it might refer to a type of trope in fanfiction where there could be some light - hearted or slightly comical situations. For example, he might encounter a magical lemon that has some special powers. However, it could also be misinterpreted as something inappropriate if not used in a proper context.
For Lily Potter, her husband James Potter might be a likely ally. He would support her in any conflict she has with Dumbledore. Also, her close friends from her school days could side with her. They know her well and would trust her judgment.
Rose Granger - Weasley could also be a main character. Given her intelligence and her family's history, she could play a crucial role. She might be the one who discovers some important clues about the servant of Nagini through her research in the Hogwarts library. And she could use her magical skills, which she has inherited from her parents, to assist Albus and others in dealing with the servant.
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.
One interesting fanfiction could be about Albus Potter's adventures at Hogwarts that mirror his father Harry's, but with his own unique twists. For example, he might face a new dark wizard threat that is related to the past but in a different way. Another could be a story where Albus discovers a long - lost spell that Harry never knew about and uses it to save the wizarding world. There are also fanfictions that focus on the relationship between Albus and his family, like how he copes with the pressure of being Harry Potter's son.