In gay stories, such a situation is not common in a general sense. It involves complex family and sexual orientation dynamics that are not typically part of the norm in most gay narratives. Most gay stories focus on consensual relationships, coming out, and finding love in a more appropriate context.
Once upon a time, there were two brothers. The big bro always protected the little bro. As they grew up, they realized their feelings for each other were more than just brotherly love. They were afraid at first, but finally decided to be honest with themselves and their family. Their family was shocked at first but gradually accepted them as they saw how much they loved each other.
Well, it should be done with a lot of sensitivity. First, the story could set up the situation as a result of extreme emotional distress or miscommunication. Then, rather than glorifying the act, it should be used as a starting point for characters to have honest conversations about boundaries, family, and sexual identity. The story could also show the characters seeking professional help or support from the community to deal with the aftermath in a healthy way. Also, make sure not to use it as a form of cheap shock value, but rather as a means to explore complex human relationships.
A possible plot could be that the big bro and little bro grow up in a strict family. They have always been close but as they reach adolescence, they start to feel a different kind of closeness. They struggle with these new feelings because of the family and social norms. Eventually, they find the courage to break free from the shackles and be together.
One common theme is the journey of self - discovery. The little bro or the big bro might be exploring their sexual orientation within the context of their relationship. Another theme could be the struggle against society's norms, as same - sex relationships are not always fully accepted in all settings.
One should expect a range of emotions. You might feel nervous, excited, or even a bit self - conscious. It's important to communicate with your partner about your feelings and boundaries.
Since there's no prior knowledge of this particular 'gay big bro armpit worship story', it could be a made - up story that combines elements of the gay community, a big brother - like character, and an unusual focus on armpits. It might be a form of creative writing that delves into some very specific and perhaps taboo - ish topics. It could also be a story shared within a small group with its own set of inside jokes or meanings that are not immediately obvious to outsiders.
I'm not sure of specific 'gay little bro big bro fanfic' stories off - hand. But you can try searching on some fanfic websites like Archive of Our Own. There are likely to be many works with this kind of relationship theme there.