It could be self - expanding. So when Harry enters, it can adjust its size according to the number of people or the amount of stuff he has with him. For example, if he has a lot of friends joining him, it can become as large as a small mansion inside.
Perhaps he buys it from a traveling wizard merchant. These merchants sometimes have rare and special items that are not easily found in regular stores. They could cross paths with Harry during one of his adventures outside of Hogwarts.
One idea could be that the magical tent becomes a portal to different magical realms. For example, it could lead to a hidden dimension full of ancient spells and forgotten magic. Another could be that the tent has a mind of its own and helps the characters in unexpected ways during a dangerous adventure, like providing magical defenses when they are under attack.
Sometimes, new original characters are created in the fanfiction. These could be young wizards or witches who discover the magical tent and embark on their own journey. They might interact with the well - known characters from the original series, like getting help from Dumbledore or facing challenges set by Voldemort.
In this fanfiction, Harry Potter might be facing a new situation in the Muggle world. Buying a car could be a sign of his further integration into Muggle society. Maybe he uses his wizard money to buy a really cool and unique car, like a classic convertible.
His best friends, Ron and Hermione, would most likely visit him. They have always been by his side through thick and thin, so they would find a way to get to the tent to check on him, bring him supplies, and offer their support.
Ron might be there too. He could use his skills in handling magical creatures to populate the island with friendly ones. And he could also help with fishing in the surrounding waters using magic, providing food for those on the island.
Yes, there might be. The Harry Potter fandom is vast, and fanfiction writers come up with all sorts of creative and unique ideas. You can try searching on popular fanfiction websites like Archive of Our Own or Fanfiction.net. There could be a story where Harry Potter is involved in buying a marriage contract in some alternate universe or as part of a very different plotline created by the fanfiction author.
The snake might be significant in relation to the Slytherin house. Since snakes are associated with Slytherin, it could be a connection to that side of the wizarding world. It could be a symbol of Harry exploring the darker or more complex aspects of magic that are often associated with Slytherin, even though he's a Gryffindor.
One challenge would be the goblins. They are very protective of Gringotts and would not easily give up control. They have their own laws and traditions regarding ownership. Harry would have to deal with their resistance and find a way to convince them or negotiate with them.