Yes, in some traditional families or families with strict discipline, such stories might be more common. Parents often believe that having another family member, like a grandparent, spank the child while they watch can be a way to enforce rules. However, modern parenting trends are moving away from physical punishment.
The phrase is very ambiguous. 'Cum' might be a misspelling or an abbreviation that is not common. If'mom let me come in her stories' is what is meant, it could imply that the mother allowed the speaker to be included or be a character in her stories. But again, this is just speculation without further details.
Maybe a child was being naughty at school, constantly disrupting the class. When the teacher informed the mom, she decided to let the child's grandfather spank the child while she watched. The spanking was not severe but was meant to show the child that such behavior is unacceptable. It was a difficult moment for the mom but she knew it was necessary for the child's upbringing.
Using that expression is not proper. Here is a story of a loving mother. A mother always cooked her child's favorite meals. When the child had to move away for college, she sent care packages full of home - cooked goodies regularly. She would also write long letters with words of encouragement and love, which made the child feel that her love was always there no matter how far away.
In a civilized society, we uphold values such as respect, family harmony and propriety. 'Cum in step mom stories' clearly violate these values and thus have no place in literature.
Educate yourself about appropriate family values and boundaries. By understanding what is respectful and moral, you can easily recognize and avoid such inappropriate stories. Also, encourage those around you to uphold positive values.
One 'watched mom story' could be about a mom who learned to bake the most delicious cakes. She started from scratch, watched countless tutorials, and finally created her own signature recipe that everyone in the family adores.