What could be the possible motives in the 'woman using fishing line to castrate husband story' if it were fictional?

It's highly unlikely to be a real event. Such a violent and extreme act is not only illegal but also goes against basic human ethics. Most stories like this are likely to be made - up or part of some very dark and untrue urban legends.

One possible motive could be extreme revenge. If the husband has been unfaithful in a very hurtful way or has committed some heinous act against the wife, she might be driven to such an extreme act out of sheer rage and a desire to cause him the ultimate harm.

One possible motive could be revenge. In fictional stories, if a man has wronged a woman severely, like through extreme betrayal or abuse, the act of castration might be used as a form of ultimate revenge to take away his masculinity and his ability to reproduce. It's a very extreme form of getting back at someone in the fictional narrative.

Perhaps she has some sort of control issues. By hypnotizing her husband into this state, she might feel like she has more power in the relationship. It could also be a very strange form of role - playing for her, where she wants to experience a different kind of dynamic in the relationship.

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.

Another motive could be the build - up of years of emotional abuse. She might have felt so trapped and hopeless that killing him seemed like the only way to end her misery.

One possible motive could be a sense of inadequacy. The wife might feel that she can't fulfill some specific desires of her husband sexually, so she arranges for a hooker. Another could be a strange form of self - sacrifice, where she puts her husband's needs above her own feelings of jealousy or propriety.

Perhaps there are underlying mental health issues involved. If the wife is suffering from certain untreated mental disorders, it could lead to such violent and inappropriate thoughts. For example, if she has a personality disorder that affects her impulse control and judgment, she might have this kind of extreme thought without fully realizing the gravity of it.

Maybe she was abused by him and couldn't take it anymore. Or he was cheating and she snapped.

One possible motive could be jealousy. Maybe the kidnapper woman is jealous of the saleswoman's success or the attention she gets from customers. Another motive might be related to a personal grudge. For example, the saleswoman might have unknowingly offended the kidnapper in the past. It could also be a case of misinformation. Perhaps the kidnapper has been wrongly informed that the saleswoman has something she wants, like a valuable item or some important information.