There could be many amateur fanfic writers out there. It might be someone who really loves the Harry Potter series and wanted to create a really unique and funny story. So it could be just an unknown fan who wanted to put their own spin on the wizarding world.
Maybe it could be due to a misfired spell in Hogwarts. Some student might accidentally cast a spell on Harry, and instead of the intended effect, it makes him grow a tail. It would be a really strange and comical situation for him.
One possible plot could be that Harry discovers his vampire heritage early on. Maybe his parents were involved with vampires in some way. As he grows, he has to hide his vampire tendencies from his Hogwarts friends while also learning to control his new powers, like super strength and enhanced senses. He might struggle with the urge to drink blood and have to find a substitute in the wizarding world.
The fanfic might explore how Harry's upbringing in the wizarding world affects his mental state as he ages. He could struggle with the pressure of being 'the boy who lived' and having so many expectations placed on him. For example, he might have anxiety about always having to be the hero. Also, his relationships with friends like Ron and Hermione could change as he matures and they all face different challenges in life. This could all be part of the psychological growth aspect of the fanfic.
Well, if we consider a 'Harry Potter grows up in Azkaban' fanfic, it could start with Voldemort winning and somehow Harry ends up in Azkaban as a baby. Growing up there, he would have to endure the cold and the constant presence of dark magic. He may learn some unusual magic just from being in that environment, and his relationships with other inmates or guards (if there are any kind interactions) could be really strange and complex.
In a wild fanfic where Harry Potter grows up, he might have all sorts of out - of - the - ordinary adventures. Maybe he'd encounter new magical creatures not in the original books. He could also develop different relationships with his friends. For example, his friendship with Ron and Hermione might take unexpected turns, like having a big fight over a new magical discovery and then reconciling in a more dramatic way.
One possible reason could be hormonal imbalance. For example, if a man has an increase in estrogen levels relative to testosterone, it can lead to breast growth. This might be due to certain medical conditions like Klinefelter syndrome.
First, he should see a doctor. The doctor can do tests to find out the cause. If it's a hormonal imbalance, they can prescribe medications to correct it.
Maybe some of the Hogwarts professors like Professor Sprout. After all, she's the Herbology teacher. She could give Harry some expert advice on how to grow different kinds of food plants. She might even let him use some special greenhouses or tools in the school for his food - growing projects.
In a fictional world where magic and reality blend, a boy is cursed by an evil witch. The curse makes him grow female breasts as a way to humiliate him. However, with the help of his friends, he embarks on a quest to break the curse. Along the way, he discovers more about himself and the true nature of the magic in his world. He also has to face the challenges of how society in his world views his new appearance.