You could directly tell that person how important it is to you that they keep it a secret. Be firm and serious about it.
If it's a situation where you can't directly stop the person, like in a group setting, you can try to create a diversion. Maybe spill a little bit of water accidentally (not too much to cause a mess) and while everyone is distracted by that, try to steer the conversation in a different direction.
You could directly tell that person that it's a private matter and you don't want your mom to know about it. Be firm and serious.
It could also be about kids trying new things without their parents' permission. Say a child tries to cook something in the kitchen when they are not allowed to, and there's a bit of a mess. They are terrified of getting spanked, so they don't want to tell their parents. The stories might be centered around these kinds of relatable childhood experiences where kids are worried about parental discipline.
You could share with them some of the negative consequences that might happen if your parents find out, like getting in trouble or feeling ashamed. This can make them more likely to respect your request.
One possible plot could be a child borrowing their parents' car without permission. They drive around the neighborhood, and maybe they accidentally scratch the car. Now they are really worried about getting spanked when their parents find out, so they keep it a secret and try to find a way to fix the scratch on their own.
Well, it might make her uncomfortable. Spanking is a rather sensitive topic and she might not want to hear about it. Also, she could get worried or think that there's something inappropriate going on.
First, you need to communicate the overall theme of the story. Is it about redemption, self - discovery, or friendship? Then, share any unique or interesting anecdotes that you think would make the story stand out. If you have a certain style of writing in mind, like a humorous or a very descriptive style, let them know. Don't forget to mention any time period that the story should be set in, whether it's the present day, the past, or the future. And of course, if there are any real - life people that you want to be thinly veiled or directly represented in the story, tell the writer about them.
Still be polite and listen quietly.
Ignore the person you don't like for a moment. Focus on your relationship with your girlfriend. Ask her why she was attracted to this other person. If she still has feelings for you, work together to fix any issues in your relationship. If she doesn't, then it might be time to move on gracefully.
Yes, if you're proud of your work. They might be more supportive than you think.