Well, perhaps it's a situation where Harry Potter is in a crowded wizarding market and he gets pushed and ends up rubbing against a mysterious new character. This new character could have some sort of hidden power or agenda. Harry is initially annoyed but then becomes intrigued as he realizes there is more to this person than meets the eye. The story could then unfold as Harry tries to figure out the mystery while dealing with these accidental rub - against moments.
One possible plot could be that in a magical accident, Harry Potter finds himself in a situation where he has to constantly be in close physical proximity to another character, like Ron. Maybe they are stuck in a shrinking charm situation and have to rub against each other to stay warm in a cold, magical environment. This could lead to some humorous and heart - warming conversations as they deal with this strange situation together.
The 'him' could be Draco Malfoy. It would create an interesting dynamic as they are usually rivals. Maybe in a situation where they are forced to work together on a secret mission for the wizarding world, and they end up in close quarters, rubbing against each other accidentally. This could lead to a change in their relationship, from enmity to a more complex understanding.
One reason could be a misunderstanding. Maybe Harry discovers some actions of Dumbledore that seem wrong at first glance, like the way he's been handling secrets about Harry's past or Hogwarts' safety. For example, Dumbledore's decision to keep Harry in the dark about certain prophecies might make Harry feel betrayed and lead to a conflict.
One possible plot could be that a dark wizard has somehow magically compelled Harry Potter to perform this action against his will. However, this goes against the core values of the original series, so it would be a very dark and twisted fanfiction. It might involve Harry having to fight against the magical compulsion through his own inner strength and the help of his friends.
One popular 'Harry Potter' fanfiction might be those that focus on the friendship between Harry, Ron and Hermione in a new adventure. For example, a story could be about them exploring a hidden part of Hogwarts not mentioned in the original books. However, 'rubbing' in the title is a bit unclear. It could potentially refer to a magical rubbing or interaction in a very unique magical context.
'Him' could be a centaur. In the Harry Potter universe, centaurs are intelligent and powerful beings. Harry might ride a centaur in a situation where he needs to quickly cross the forest and the centaur's speed and knowledge of the terrain would be very useful.
There are several fanfiction websites where you might find 'Harry Potter' fanfiction. One of the well - known ones is Archive of Our Own (AO3). It has a vast collection of fan - created stories, though you might have to do some searching to find ones related to this rather unclear 'rubbing' concept. Another site could be FanFiction.net, which also has a large number of 'Harry Potter' fanfictions.
One possible reason could be a difference in ideology. Maybe Harry starts to question Dumbledore's decisions regarding the war against Voldemort. For example, Dumbledore's secrecy about certain things might make Harry feel left out and manipulated. Another reason could be personal pride. Harry has grown into a powerful wizard and may not want to be under Dumbledore's constant guidance and control any longer. He might think he can handle things on his own better. Also, it could be due to the influence of other characters. If some new friends or allies have different views on Dumbledore, they could sway Harry's opinion.
Harry could win by using his intelligence. He might figure out a way to separate Thanos from the Infinity Stones. Without the stones, Thanos is still strong but more vulnerable. Harry could also use the magic of Hogwarts, like the protective spells around the school, to trap Thanos.
The 'him' could also be Snape. In a fanfiction, a spell or a magical experiment could go awry and force Harry to touch Snape. Given their complex relationship in the original series, this forced touch could be a catalyst for a lot of emotions. Harry might finally understand some of Snape's motives or Snape might have a moment of vulnerability that changes how he views Harry.
It could be Voldemort in a really strange and dark fanfiction concept. Maybe Voldemort has found a way to magically force Harry to perform this action as a form of humiliation and domination. This would be a very different take on their relationship compared to the original series.