I'm not really sure specifically about such characters in gay stories. There are a wide variety of gay stories out there with diverse characters, but this description seems rather specific and might not be a common trope in all gay literature.
Perhaps it could be a humorous take on a character's transformation gone wrong. Let's say Ron accidentally casts a spell on himself that gives him a 'huge bubble butt' and the fanfic could be about his attempts to reverse the spell while dealing with the embarrassment and hilarity that ensues among his friends at Hogwarts. It could also involve the teachers trying to figure out how to fix it without causing more chaos in the school.
There could be. In some cases, gay athletes or fitness enthusiasts might share stories of their transformation into having huge muscles and a bubble butt. These stories can be inspiring for others in the gay community who are also interested in fitness. They may talk about the motivation behind their physical transformation, whether it was for personal health, to attract a partner, or to feel more confident in their own skin. It can also be a way for them to express their identity through their physical appearance.
I'm not sure if there are specific 'Harry Potter' fanfics directly related to such a phrase. Fanfics usually focus on various aspects like the adventures of the characters, their relationships, or exploring different magical elements. It's a rather strange and not so common theme to find in mainstream 'Harry Potter' fanfiction.
One positive story could be of a gay man who was initially self - conscious about his body. He started working out to build huge muscles and tone his butt. Through this journey, he not only achieved his physical goals but also found a great sense of community at his gym. He made friends with other like - minded gay individuals, and they supported each other. His new - found confidence also led to him getting a great job where he felt more assertive and self - assured.
Ben 10 has stories that focus on his relationships too. His bond with his family, especially his grandfather Max and his cousin Gwen. They often go on adventures together, and there are times when they have to rely on each other. For instance, when they are trapped in an alien dimension and have to work together to find a way back home.
In the 'Ben 10' series, Ben Tennyson is the main character. He has a device called the Omnitrix which allows him to transform into various alien forms. Gwen Tennyson is Ben's cousin. She also has magical abilities and often teams up with Ben in their adventures.