I'm not aware of any specific place dedicated solely to Bowser Jr. gay fanfic. However, some general fanfic websites like Archive of Our Own (AO3) might have such works if they are in line with their content policies.
Some gaming forums also have sections dedicated to fanfiction. For example, Nintendo - related forums might have threads where fans share their Bowser Jr. and Bowser fanfics. You can interact with other fans there, too, and maybe even get some recommendations based on what others have liked.
You can try fanfiction websites like Archive of Our Own or FanFiction.net. They have a wide variety of fan - created stories, including those about Bowser and Bowser Jr.
Well, in the world of fanfic, there could be some Bowser Jr. - related gay fanfic out there. However, it might be a bit niche. It could potentially explore new aspects of the character, like his personality in a different light within a romantic or friendship - like relationship with another character. But finding good ones might take some digging through different fanfic platforms.
You can start by looking at major fanfic websites like Archive of Our Own (AO3). It has a wide range of fanfictions, and you might be able to find 'gay muscle bowser fanfic' there. Just use the search function and type in relevant keywords.
Some gaming - related forums might also be a good place to look. Gamers who are fans of the characters might share their own fanfiction creations or know where to find some good ones. For example, if there are forums dedicated to the game that these characters are from, it's likely that someone has written or can point you towards some Bowser Jr. x Cody fanfiction.
You could also try checking out some Nintendo - specific fanfiction forums or communities. These places might have members who are really into creating or sharing stories about unique pairings like Bowser Jr. and Inkling Girl. Sometimes these smaller communities can have some hidden gems that you won't find on the bigger platforms.
In some fanfics, there might be a plot where Bowser Jr. tries to prove himself to Bowser. He might take on a difficult task on his own, like stealing a precious jewel from a well - guarded castle. This shows his growth and determination to be a worthy heir to Bowser. And it also adds a touch of family - like relationship exploration between them.
One possible theme could be family. As Bowser and Bowser Jr. are father - son, the fanfic could explore the dynamics of their family relationship. It could show how they support each other, or how Bowser is trying to raise Bowser Jr. to be a worthy heir.
One interesting fanfic could be about Bowser Jr. going on a solo adventure to prove himself to Bowser. He might encounter some of Mario's friends and have to use his wits to get out of tricky situations.
His father Bowser could be a major character too. He might be searching for his son throughout the fanfic. There could also be other Koopa characters like the Koopalings. They could be on a mission to bring Bowser Jr. back or they might be secretly supporting his decision to run away.