One interesting plot development could be Snape initially being very reluctant to take care of deaged Harry. He might see it as an unwanted burden, but as time passes, he starts to notice Harry's innocence and vulnerability, and gradually warms up to him. For example, he might start making special potions to help Harry regain his proper age more comfortably.
It's popular because it creates an interesting dynamic. Snape has always had a complex relationship with Harry in the original series. When Harry is deaged, it gives Snape a chance to start anew and perhaps be a different kind of influence. It also allows for exploring Snape's more nurturing side which is a contrast to his usual cold persona.
There's 'Snape and the Deaged Savior'. In this fanfiction, Snape discovers deaged Harry in an unexpected place. He takes on the role of caretaker with his usual grumpy exterior but deep down shows a lot of care. He teaches Harry magic in a different way than the normal Hogwarts curriculum, which makes for an interesting read.
Snape's character may become more empathetic. At first, he might be his usual cold self, but as he takes care of Harry, he starts to understand Harry's situation better and shows more kindness.
One interesting deaged Snape and Harry fanfiction could be about Snape being deaged to Harry's age and them having to work together on a special project at Hogwarts. They might start to see each other in a new light, away from their usual teacher - student dynamic.
Definitely. Fanfiction allows for different interpretations of characters. Snape's care for Harry can be seen through his actions in some stories. Maybe he leaves anonymous hints for Harry to solve problems or uses his influence to keep Harry out of certain harms. It's an interesting exploration of what could have been between them.
You can try fanfiction.net. It has a large collection of Harry Potter fanfictions, and there's a good chance you'll find some great deaged Snape and Harry stories there. Just use the search function and type in relevant keywords like 'deaged Snape Harry' and browse through the results.
Well, another one could be 'Hermione's Unforeseen Guardian'. In this story, Snape's care for Hermione is a bit of a secret at first. He quietly aids her in her research and when she gets into trouble with some dark wizards who are after her knowledge, Snape steps in to save her. It shows a different side of Snape, one that is more compassionate and protective towards Hermione.
In some fanfictions, Snape's care for Harry might be shown through secret protection. For example, he might keep an eye on Harry during dangerous situations at Hogwarts without Harry knowing. He could also subtly guide Harry in his studies of Potions, giving him hints that are not obvious to others.
A possible plot could be that Draco has to figure out how to reverse the de - aging spell on Harry. In the process, he might have to seek help from unexpected sources, like some old family magic or even some of the more reclusive wizards in the wizarding world. This journey could bring him and Harry closer together as they face various challenges and obstacles.