Seito-tachi ni Sarashimono ni Sareta Onna Kyoushi Tachibana Hitomi Byouin Hen 4

Tachibana-sensei was the teacher of privileged students at a rich private academy, who was caught on video doing naughty things, and used as a sex slave. She is forced to do/wear unbelievably embarrassing things by men who are much younger than herself.