It could be Dumbledore. He always had a way of presenting Harry with things that would help him on his journey. Maybe Dumbledore had been holding onto this second wand for a special occasion or because he knew Harry would need it in the future.
Maybe an old, reclusive wand - maker who has been waiting for the right wizard to come along. This person could have a special intuition about wands and see something unique in Harry.
There's a chance that the maker is a new character, an old hermit wizard who lives deep in the Forbidden Forest. He has been observing Harry from afar and realizes that the wands available in the regular market are not sufficient for him. So, he uses his knowledge of forgotten magics to craft a custom wand just for Harry.
Maybe it's an old wandmaker from a far - off land. This wandmaker has been crafting wands for centuries and has a unique intuition about which wands are meant for which wizards. He sees something special in Harry and presents him with a new wand.
It could be an old and wise wizard who has been living in seclusion for years. He might be an expert in wand lore and has a special connection to the magical core materials used in wand - making.
In the 'Harry Gets a Second Wand Fanfiction', it might be that the second wand is a gift from an unexpected source. This could be a powerful magical being who sees great potential in Harry. With the second wand, Harry could have an advantage in battles against dark forces. He might be able to combine spells in unique ways that he couldn't before, since each wand has its own characteristics.
Well, if Harry gets a different wand in the fanfiction, it might change his relationship with other characters. For example, wizards might view him differently based on the new wand's appearance or reputation. Also, the new wand could have a different origin or history that gets intertwined with Harry's journey, opening up new storylines and adventures.
Well, he might discover new magical abilities. The custom wand could be made of unique materials, like a core from a rare magical creature. This could give him an edge in spells.
One possible reason could be a moment of sudden realization. Maybe Draco realizes that Harry is in a dire situation where he needs the wand to defend against a common enemy. It could be a sign of a shift in Draco's character, from being an antagonist to having a moment of altruism.
One possible fanfic could be about how Harry discovers new and unexpected powers of his wand. Maybe it starts with him accidentally using the wand in a way he never has before during a simple spell - like making a flower bloom in an extraordinary way that defies normal magic. This could lead to a journey of exploration as he tries to understand the true potential of his wand, perhaps with the help of Hermione and Ron.