No way. This kind of story is not something that should be spread around. Family relationships are based on respect and trust, and sharing such a story violates that. It's a private matter that should stay within the family.
First of all, don't panic too much. It was an accident. You can quickly cover up and try to act as normal as possible. Maybe just say something like 'Oops, sorry about that' in a light - hearted way to ease the momentary embarrassment.
You can talk to your mom about it casually if you feel comfortable. Maybe she doesn't think it's a big deal either. It can help relieve the embarrassment. And then move on and not dwell on it too much.
No, it is completely inappropriate. Such stories involve violating privacy and are not suitable for sharing at all. We should respect family members' privacy and boundaries.
First, don't panic. If you're a minor, it's important to have an honest conversation with your mom about why you were reading it. Maybe it was out of curiosity. Assure her that you understand it might not be appropriate content for your age. For example, you could say 'Mom, I know this was wrong, I was just curious, but I won't do it again.'
Tell her it was for a creative writing class or a writing exercise with a very specific purpose. For instance, you could say 'Mom, I'm doing a writing assignment where we have to explore different types of stories, and this was just an exercise, not something I'm into personally.'
This is a very delicate situation. You need to understand that it was an accident and not something you were seeking. It's important to respect her dignity. You might also want to consider if there was any way you could have avoided seeing her in that state, like knocking louder or waiting longer before entering a room. In any case, keep your reaction calm and respectful, and don't let this incident create unnecessary tension or discomfort in your relationship with your friend or his mom.
If you saw your mom naked by accident, it's important to respect her privacy. Don't make a big fuss about it. Just act as normal as possible afterwards. And don't bring it up again unless she does. This is a very private and delicate matter.