He invites the beautiful instructor to his home under the pretext of teaching him English conversation and cooking, but ends up asking her sexually harassing questions, staring at her cleavage, and showing off his erection, only to be scolded. So the man secretly puts an aphrodisiac in her drink. Gradually the aphrodisiac starts to take effect, and he begins to change, breathing heavily and his eyes becoming glazed. When he shows the instructor his erection again, she tries to stay rational, but her behavior has completely changed from before, staring at his dick while drooling...