One possible motive could be revenge. Maybe the blackmailer felt that the gym teacher had been too strict with them in the past and this was their way of getting back. For example, if the gym teacher had made a student run extra laps for being late, the student might seek revenge through blackmail.
Another motive could be to gain an unfair advantage. A student might blackmail a gym teacher to get a leading role in a sports event or a guaranteed place on a team. For instance, if the gym teacher is in charge of selecting students for a basketball tournament, a student could use blackmail to secure their spot.
Jealousy might be a motive. If the person feels that the mother - in - law is getting more attention or resources within the family, they could resort to blackmail to get what they think is their fair share or to simply spite her. Another reason could be revenge. Perhaps the mother - in - law has done something in the past that the person hasn't forgiven, and they see blackmail as a way to get back at her.
One possible motive could be greed. The person blackmailing the aunt might want her money or valuable possessions. For example, if the aunt is rich and has a lot of jewels or a large inheritance.
One possible motive could be pure maliciousness. Some people just like to cause trouble and harm others. Another motive might be a form of revenge. Maybe they feel wronged by the person in some way and think this is a way to get back at them.
It could be revenge. Maybe someone had a grudge against her and decided to take extreme action.
It could be that he has some personal issues that he feels the gym teacher can understand. Perhaps he is self - conscious about his body and the gym teacher, who is often associated with fitness and health, seems like a good person to talk to about his insecurities.
One major consequence is getting expelled from school. Schools have a zero - tolerance policy for such unethical behavior.
The teacher might have had a deluded idea of 'helping' the student in a very wrong way. They could have thought that by abducting the student, they could 'protect' the student from something they perceived as harmful, like a bad home environment. However, this is still completely unacceptable behavior. Another aspect could be that the teacher was simply a criminal minded person who saw an opportunity and took advantage of the trust the student had in them.
One possible motive could be to create chaos in the school community. Some people might want to disrupt the normal functioning of the school.
The teacher - student relationship would be completely ruined. It would be hard for them to ever trust each other again. And the student would get a bad reputation among the other teachers and students. Like, no one would want to be friends with a blackmailer.
The plot could be about the gay boy having some personal struggles, like bullying at school perhaps related to his sexual orientation. He confides in the gym teacher because he sees the teacher as a trustworthy figure. Maybe he shares his feelings of isolation and the teacher offers support and advice on how to deal with the difficult situation.