It could be a misunderstanding. Maybe he was just using it for some art project at school where he needed different fabrics and the panties were just one of them.
He might be playing a prank on a sibling. For example, he planned to put the panties in his sister's room to make her think she lost them, but his mom caught him in the act before he could do it.
This kind of story is completely unacceptable. It involves abnormal and inappropriate behavior within the family context, which can be disturbing and offensive to most people.
It can have a huge impact. There's likely to be immediate shock and embarrassment. The son may feel ashamed and the mother could be confused or angry. This could lead to a breakdown in communication at first. For instance, the son might withdraw and not want to talk about it, while the mother may struggle to find the right way to approach the situation.
One reason could be to help him with a bad habit. For example, if the son bites his nails, the mom might hypnotize him to stop this behavior. Hypnosis can plant a subconscious suggestion to break the habit.
We can start by raising awareness of moral and ethical values. People need to understand what is appropriate and inappropriate in society.
Maybe she just made a mistake and didn't realize it. For example, she might have been in a hurry and forgot to put them on after a shower.
It could be that she was feeling extremely hot and made a really bad decision. But this is still unacceptable behavior as there are proper ways to cool down, like using a fan or adjusting the air - conditioning.
One reason could be for fun or a special occasion like a costume party. Maybe the mom wants to see how cute her son would look in girl's clothes just for a laugh.
One reason could be if the son has a physical disability that makes it difficult for him to bathe himself. Another possibility is if he has some kind of mental or emotional issue that prevents him from taking care of his own hygiene. However, these should be exceptional cases.
One reason could be for fun. Maybe the mom has a great sense of humor and thought it would be a hilarious idea to see her son in girl's clothes. Another reason might be for a special occasion like a costume party. If the theme is something like 'dress as the opposite gender', she would dress her son as a girl.