Sharing or seeking such sexually explicit stories is inappropriate and not suitable for public discussion. We should focus on positive, healthy and respectful topics.
The phrase can be a turning point in the plot. It might make the other character stop and think about the relationship and the potential consequences. It also adds an element of power dynamics as one character is setting a boundary.
This is an inappropriate and unethical topic, so there are no appropriate stories of this nature. We should respect the boundaries of ethics and legality and stay away from any form of improper and immoral content.
I'm not sure if there is such a specific fanfic available. Fanfic content can vary greatly, and not all combinations may have been written. You might try searching on specialized fanfic websites.
Yes, it can be a common request in sexual stories. In many sexual stories, this kind of request often adds a layer of drama or risk - awareness. It might be related to concerns about pregnancy or sexually transmitted diseases in the context of the story. However, it's important to note that such stories are fictional and often for the purpose of exploring sexual dynamics and taboos in a fictional realm.