Well, for starters, it's not something that's appropriate between a mother and child. There are legal, moral, and emotional factors to consider. Sex is a very personal and mature decision that should happen with someone of your age and when you are mentally and emotionally prepared for it.
Well, it could be that she is used to a laid - back lifestyle at home. In some families, the home environment is very comfortable and relaxed. Mom might feel that there's no need to be formally dressed all the time. Wearing just a T - shirt makes her feel free and unrestricted. It also allows her to move around more easily when doing household chores or simply relaxing on the couch.
Maybe she wants to teach some life lessons in a different way. For example, she might use a taboo - related story to show the consequences of certain actions that are not usually talked about openly.
Maybe it's to control population growth and maintain resources. The consequence could be a lot of frustration and social unrest.
It could also be that they have a distorted view of relationships. Maybe they are in a place in their own lives where they are confused about loyalty and commitment, and so they are drawn to these kinds of stories. However, this is not a healthy interest as it goes against the basic principles of a good relationship. We should focus on positive relationship stories that can inspire us to build better relationships in our own lives.
It could be that the old lady has some old - fashioned ideas about sharing life experiences, including some inappropriate ones, without realizing the inappropriateness. She might have thought it was a normal part of sharing wisdom from her own life.
One possible reason could be that the author has run out of ideas for Naruto's character development. Maybe they've explored all the typical arcs and growth opportunities for him in their story, and don't know how to take it further. Another reason might be that they want to shift the focus to other characters in the fanfic. Sometimes, a fanfic starts with one main character like Naruto, but as the story progresses, other characters become more interesting to develop.
Maybe she wants to spice up their relationship. It could be a way to increase intimacy and trust between them.
Another aspect is that it can be a way to gain knowledge, in a way. Through these stories, we might learn about different cultural attitudes towards sex, different forms of communication in relationships that are related to sexual aspects, and so on. However, it's important to note that these should be consumed in an appropriate and legal context.
One reason could be love. A mom might be submissive because she loves her children so much that she is willing to sacrifice her own wants. For example, she'll let them have the last piece of cake.
When it comes to safety issues, moms may spank. For example, if a child runs into the street without looking, the mom might spank to make sure the child understands how dangerous it was and never does it again. It's a way to quickly drive home the importance of safety.