There could be. Fanfiction is a vast world. However, it might not be a very common theme. But some authors who like to explore different aspects of characters might have written about Snape washing his hair. You can look for it in the relevant fandom sections of major fanfiction platforms.
It's inappropriate because it involves a very private and sensitive area. There are boundaries in personal and family relationships, and this topic crosses those boundaries in an uncomfortable way.
In this fanfiction, the scene of Carlisle washing Bella's wounds is significant as it likely serves to develop character relationships. It shows Carlisle as a protector and healer, which are important aspects of his character. For Bella, it might make her feel more connected to Carlisle and the world he represents. It could also foreshadow future events, perhaps if Bella's wounds are part of a larger threat or mystery in the story, Carlisle's act of washing them could be the starting point of their journey to uncover the truth.
Jean Shepherd in the 'Jean Shepherd Christmas Story' is the creative force behind the story. He was likely drawing on his own childhood experiences during Christmas. His descriptions are so detailed that you can almost feel like you're there with Ralphie, experiencing the joys and challenges of Christmas in that era. He's the one who weaves together all the elements of the story, from the family scenes to the Christmas shopping trips.
Jean Shepherd in 'Jean Shepherd A Christmas Story' is the storyteller. He shares his memories or fictionalized accounts of a boy's Christmas. He has a unique style of narration that gives the story its charm. His observations and descriptions of the characters, events, and the overall Christmas atmosphere are what make the story so engaging.
Well, we could expect it to be quite character - driven. Since it's about Snape washing his hair, it might explore his thoughts during this mundane activity. It could also include some interactions with other characters, for example, if someone were to interrupt him while he's washing his hair. Or it might just be a humorous take on Snape's character in a rather unexpected situation.
Jean Hilliard is the central figure in the 'Jean Hilliard Frozen True Story'. She is the one who experienced being frozen in extremely cold conditions and miraculously survived.