Perhaps Harry was hiding in the cubbard for some reason, like playing a game or trying to avoid someone. But the cubbard was too stuffy and hot, which led to him getting a heat stroke. Maybe he was found later and had to be taken care of by his friends.
Well, it could be that the cubbard was in a special location, for example, near a furnace or in a very warm part of the building. Harry might have been locked in there by accident or as a prank. Due to the lack of ventilation and high temperature, he got a heat stroke. His friends would then search for him and finally find him in a bad state in the cubbard.
In this fanfic, it's possible that Harry was exploring an old, unused part of a building where the cubbard was. He didn't realize how hot it was inside. As he stayed in there longer, maybe looking for something interesting, his body couldn't handle the heat and he got a heat stroke. His discovery of the heat stroke situation could be the start of a series of events where his friends come to his rescue and they uncover some secrets about the place together.
His friends like Ron and Hermione would most likely be the ones to help him. They are always there for Harry in difficult situations.
Well, it could be about a character in the Naruto universe who somehow obtains the Heat Heat Fruit. Maybe they use its powers to fight stronger enemies. For example, they could create intense heat waves to defeat opponents in battles, just like how characters in One Piece use Devil Fruits' powers.
In this fanfic, Harry might get a job as an Auror. He would be involved in solving magical crimes, going on dangerous missions, and working with his old friends to keep the wizarding world safe.
Well, maybe Harry goes to Vegas on a whim. He meets someone special there, like a girl who is also there for a wild adventure. They fall in love quickly and decide to get married in one of those kitschy Vegas chapels. Then they might face some challenges as they get to know each other better, like finding out they have very different lifestyles.
In such a fanfic, perhaps Harry discovers some long - hidden, damning secret about Dumbledore. Maybe it's related to Dumbledore's past actions with Grindelwald. Harry, being the honest and justice - seeking person he is, feels compelled to expose this secret, which then leads to Dumbledore being fired from his position at Hogwarts.
One possible plot could be that it starts with an unexpected encounter between Harry and Gabrielle. Maybe they are in a situation where they have to work closely together, like in a magical mission. As they spend more time together, feelings develop and one thing leads to another, resulting in Gabrielle getting pregnant. Then the story could focus on how they deal with the news, the reactions of their friends and families, and their own fears and hopes for the future.
Maybe Harry accidentally frames Weasley for something. It could be due to a misunderstanding, like a spell gone wrong that makes it seem like Weasley was involved in some illegal magic use.
Well, he could work at Hogwarts during the summer for a change. Maybe he's helping Hagrid with the care of magical creatures. He would get to interact with new and dangerous beasts, and at the same time, he might learn some new spells to keep them in check from other professors.
One possible plot could be a trainer going on vacation to a hot region in the Pokemon world. They might encounter Fire - type Pokemon that are more active in the heat. For example, they could meet a group of Charmander near a volcano. The trainer could then have adventures like helping a local Pokemon center deal with Pokemon that are overheated due to the extreme climate.
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.