It was a story from at least over a year ago. It was a multiple chapter story if I remember correctly. The premise of the story was a teacher was learning/forced to become submissive to a student. The main part that I remember was in one of the later chapters (3?) the teacher is caught by a fellow teacher/coworker and is blackmailed into sex by threatening to tell the daughter. The fellow teacher/coworker is also now the main teacher's exhusband's wife. Thank you for any help!