In a fictional story, it could be due to cultural norms. If the fictional society has a patriarchal system where men are seen as superior, a man might feel entitled to control a woman. He could use traditional values as an excuse to limit her freedom. Also, if the man has some sort of secret over the woman, like he knows about a crime she committed in the past, he could blackmail her into doing his will.
Once upon a time, there was a young woman named Lily. She lived in a small town. A powerful man named Mr. Black controlled her life. He made her work long hours in his factory for very little pay. Lily was too afraid to resist because Mr. Black had connections with the local authorities. One day, a kind traveler came to town and saw Lily's plight. He inspired her to stand up for herself. With newfound courage, Lily finally broke free from Mr. Black's control.
Perhaps a curse from an ancient artifact. If he unknowingly disturbs an ancient tomb or touches a cursed object, it could bring about this transformation. This is a common trope in adventure - themed fictional stories, where characters face the consequences of meddling with the unknown and the supernatural.
One possible reason could be some sort of magical or supernatural curse. For example, in some fantasy stories, an evil witch might cast a spell on a man, transforming him into a woman as a form of punishment or just for her own amusement. Another reason could be a scientific experiment gone wrong. Scientists in a fictional story might be trying to develop a new gender - changing technology, and a man could be an unwilling test subject.
It could be that the man was dancing too close to her and she felt invaded or harassed, so she reacted by punching him.
Maybe she was playing a prank that went wrong. For example, she might have thought it would be funny to hide in the suitcase as a surprise, but then couldn't get out.
A curse is another common factor. In some stories, an ancient curse placed on a family or an individual for some past misdeed might result in a man turning into a woman. The curse could be activated by a specific event like reaching a certain age or entering a particular place.
Scientific experiment gone wrong. In a science - fiction type of story, a scientist might be working on a new technology related to gender transformation, and something goes haywire during the experiment on a male subject, causing him to turn into a woman.
One reason could be self - identity. The man may have always felt that his true self was female. Another reason might be influenced by the people around him. For example, if he has many female friends and is exposed to their experiences, he might start to identify more with the female gender.
One possible reason could be a magical or supernatural curse. Maybe he offended a powerful witch or wizard who cast a spell on him. Another reason could be some sort of scientific experiment gone wrong. For example, if he was part of a secret experiment involving hormones or genetic manipulation, and things didn't go as planned.
Another possible reason in a fictional story could be some sort of cult - like or fanatical group's practice. The girdle - wearing might be part of the group's traditional dress, and the spanking could be a form of 'cleansing' or punishment for not following the group's extreme beliefs. But again, this is just fictional speculation and not representative of normal or acceptable behavior.