The mother let her son's homeroom teacher fuck her because she wanted her son to become class president

We are parents and children living with their son. My husband, Yugo, had a difficult time living because his husband disappeared a few years ago, but recently he has learned to devote himself to club activities and live a happy and peaceful. However, one day, the teacher, Sugiura, who visited my house, told me that my boy was still as bad at studying as before. As for me, who is desperate with such an unrealistic situation, Dr. Sugiura is approaching me to clear my son's withdrawal on the condition that he presents his body.