One common scenario is after a battle. Harry is injured, and Snape, despite their differences, steps in to heal him. Maybe it's a fight against the Death Eaters where Harry is seriously wounded, and Snape realizes he has to put aside their enmity for the greater good.
A third common scenario is when Harry is sick due to some magical disease or ailment. Snape, being a Potions master, uses his skills in brewing remedies. He might search for rare ingredients, consult ancient tomes, and spend days in his dungeon laboratory to come up with a cure for Harry. This shows his dedication to healing Harry, even though their relationship in the original story is complex and often fraught with tension.
Often, in the fanfic, it could be that Harry is injured during a Quidditch match. Snape, despite his dislike for Harry in some ways, realizes the importance of Harry to the wizarding world and heals him. There could also be a situation where Harry is affected by some dark magic in the Forbidden Forest. Snape, who has a deep understanding of dark magic, is the only one who can counter it and heal Harry. It might also happen that Harry is suffering from the after - effects of using powerful magic, and Snape uses his own unique magic to heal Harry's drained energy.
In some fanfictions, Snape might use his advanced knowledge of potions to create a special concoction to heal Harry. He could draw on his skills in Herbology as well to find rare ingredients for the potion.
A common scenario is that Harry is made to scrub cauldrons. Snape would be hovering nearby, making sarcastic remarks about Harry's sloppiness. Another one could be that Harry has to organize Snape's Potions ingredients in alphabetical order while Snape quizzes him on their properties.
One common plot device is the revelation of Snape's hidden motives. As he heals Harry, we might discover that his actions are not just out of duty but also out of a long - held, unspoken love or loyalty. Another is the use of rare and dangerous ingredients in the potions he makes for Harry's healing.
One common scenario is Snape helping Harry with his Potions work. Since Snape is the Potions master, he might offer some extra guidance to Harry, which could be crucial for Harry's progress in school. Another scenario could be Snape protecting Harry from the bullying of other Slytherins. He might not do it in an obvious way, but still intervenes subtly.
In some fanfictions, Snape might use his advanced knowledge of potions to brew a special healing elixir for Harry. He could also use his magic skills, like a complex spell specifically designed to mend Harry's wounds, whether they are physical or emotional.
One common scenario is when Harry has a nightmare about his parents' death. He might then seek out Snape, knowing that Snape was also connected to his mother. Snape could offer some memories or stories about Lily that would bring Harry a sense of comfort. Another scenario could be when Harry is struggling with his identity as the Chosen One. Snape, who has his own complex identity within the wizarding world, could provide some perspective and comfort to Harry.
Often, Snape will single out Harry in front of the whole class. He might publicly criticize Harry's work or attitude. For example, when Harry is assigned a group project in Potions, Snape might give Harry extra tasks or set higher standards just for him. And during exams, Snape could be extra strict when grading Harry's papers.
One common scenario is that Snape saves Harry's life in a more personal way than in the original story. This act of heroism makes Harry see Snape in a new light and starts the journey towards friendship. Another is when they discover a common interest, like a love for a particular type of magic or potion - making. This shared interest bridges the gap between them.