The dad must point out to the son that the dad has been married (as in my case) 24 years without any infidelity with another woman.(So even “hard wired males” can learn to confine one’s “sexual tensions” to one woman) Then the son gets severely banned from any meaningful fun activities and driving privileges revoked
for an undetermined time. A big heaping portion of shame and moral teaching will be served up with the proviso that if the son doesn’t like to hear it, he can leave the house and make his own way in life!
This is a legal case not a moral one. The teacher is the one culpable under the law and should be prosecuted period. But the son did what exactly that should lead to punishment like say taking away his car keys? Similar situation reverse the gender roles and the girl would automatically be a victim. Even if the girl was sexually active for years prior and seduced the teacher, legally and ethically it is still the teachers responsibility and the girl is a victim. Switch the roles again and now the boy should be punished, kicked out of the house? The only moral or biblical law he broke was sleeping with another man’s wife, now that is something I would tell my son is stupid, dangerous, immoral and can destroy a family.