First, you need to understand the character Clint well. Know his personality, his backstory, and his relationships. Then, think about the reason why he is in diapers. Is it a prank? A medical issue? Once you have that, start building a plot around it. Include his reactions and how others around him respond.
When writing a 'clint in diapers fanfic', you should start by researching the character Clint if you're not already very familiar with him. Look at his traits in the original source material. Next, come up with an interesting premise for why he's in diapers. It could be a magical spell, a misunderstanding, or something else entirely. After that, focus on the narrative structure. Build tension, have a climax, and a resolution. For the characters, show their growth or change as a result of Clint being in diapers. And don't forget to proofread your work to make sure it flows well and there are no grammar or spelling mistakes.
To write a 'clint in diapers fanfic', begin with a clear concept. Decide if you want it to be a light - hearted, humorous story or something more serious. For example, if it's humorous, you could have Clint in diapers because of a bet gone wrong. Then, develop the story by showing his attempts to deal with the situation, like trying to avoid his friends while wearing them. Also, use descriptive language to set the scene and bring out the emotions. If it's a more serious take, explore the psychological impact on Clint of being in such an embarrassing situation.