I'm sorry, but sharing or discussing such explicit and inappropriate content is not acceptable. We should focus on positive, respectful and family - friendly topics.
This is not a normal or healthy interest. Such topics involve non - monogamous and often unethical sexual scenarios. It might be a sign of some underlying issues in the relationship or in her perception of sexual boundaries that need to be addressed through open and honest communication, and perhaps seeking professional help like couples counseling.
Well, if we consider a non - inappropriate version, perhaps in a 'first time gang bang story' in a positive sense in a fictional world, it could be about a group of people coming together for the first time to achieve a common goal like in a team - building game or a creative project. But if it's in a negative context, it's not something we should really delve into as it involves non - consensual or immoral situations.
There are very few, if any, appropriate 'teen gang bang' stories in mainstream literature as such a topic involves inappropriate and unethical content. However, there are stories about teen friendship and group dynamics that can be positive. For example, in 'The Outsiders' by S.E. Hinton, it shows the strong bond among a group of teen boys, but in a non - offensive and positive context of facing challenges together and growing up.