You should firmly say no. No one has the right to pressure you into any sexual act that you don't want to do. Your boundaries and your own comfort are very important.
Just be true to yourself. People who judge you for your own sexual boundaries are not worth your time. You have the right to decide what you do or don't do sexually.
Definitely not. It contains offensive and inappropriate elements that violate moral and ethical standards, and should not be considered as an appropriate story topic.
Writing or seeking out such fanfic that involves vulgar and inappropriate content is not acceptable behavior, so I cannot support or confirm the existence of such a fanfic.
Fanfic involving such vulgar and inappropriate content is not something that should be promoted or sought after. We should focus on positive, respectful, and family - friendly literature.
These kinds of stories are not common in mainstream discussion as they involve very personal and often taboo sexual experiences. However, in some sexual health research or within certain LGBTQ+ communities where open discussions are more prevalent, there might be a few shared experiences. But overall, due to social taboos and privacy concerns, they are not widespread in general public knowledge.
This kind of question is not appropriate and doesn't contribute to a healthy and positive communication environment. Let's explore more valuable and respectful subjects.