Jane Euphemia Potter realises at a very young age that she is, in fact a boy, and delightedly tells his parents so. He changes his name to James Fleamont Potter, uses he/him/his pronouns, being very male, and happy. But his parents decide to send him to a muggle school so he knows how to handle muggle society. The school won’t accept his gender (being transgender wasn’t widely accepted then), and he is bullied, but he stands up for himself and his parents are so proud of him for that. When he gets his Hogwarts letter, he is delighted to see that they have used his preferred name, and dares to hope he’ll be able to start anew there, for everybody to see him as male and not as trans. By then his chest is growing, so he buys some bandages and binds his chest with them, though he knows it’s bad for him, and goes to Hogwarts like that. He and his friends are sorted into Gryffindor, and he manages to get by with his bandages, and for once in his life he feels like everyone around him sees him as a boy. For the next six years, he’s happy, carefree James, laughing and pranking people and flirting with Lily Evans, one of the infamous Marauders, his best friends by his side. Mcgonagall’s the first to know, she sees it in how he always looks uncomfortable once a month ( his cycle actually happens to be the same as Remus’s). She confronts him about it, and gives him support. Lily is the next to notice, she sees it in his uncomfortable positions and squirming and grumpiness. Her realisation and confronting him is the start of an unlikely friendship and the realisation for that he’s not as bad as he seems. By the start end of sixth year, it’s becoming harder and harder to hide it, the cramp pain is increasing and his chest is even larger now. But he pushes that aside because Remus’s transformations are getting worse and he needs more help. But one day Remus sees a period pads in the toilet, after an attempt to flush it, and everything just clicks. So the next week, he returns from the hospital wing a day or so after the full moon to find Sirius and Peter in the common room, but not James. He finds him curled up on his bed, so Remus just walks up to him, and puts his arms around him, whispering thank yous. He explains how thankful he is for James neglecting his own pain for Remus’s, how he should have told them sooner, that he’s still the same James and his best friend and nothing will ever change that. And by the end of his speech, tears are streaking down James’s face, but he’s smiling because somebody accepts him! They don’t hate him! And he’s so happy, and they both go down to the common room, Remus supporting James, and tell their friends. They couldn’t be more supportive, standing up for him, helping him, celebrating when he gets top surgery and when he gets an advanced transfigurer to change his body to fully male. But he keeps the top surgery scars. They’re a part of him, they make him who he is. And when his friends are all there, hugging him so hard he can’t breathe, he realises that he’s all he’s always wanted. A non-dysphoric man with the most supportive, best, nicest friends you could ever ask for. He’s happy.