Female teacher’s gang-rape with aphrodisiac by DQN students, convulsions and sweaty orgasm

女教師キメセク輪姦　DQNな生徒達の媚薬漬けレ×プで痙攣汗だくアクメ堕ち　五十嵐なつ

Also known as FSDSS-536

Teacher Natsu steps in to help a student who was getting bullied, and this enraged the bullies who turned against her. The protagonist should maybe gather his courage and attempt a heroic rescue of his savior teacher, but instead, witness the developments with a sad erection in his pants.