Sarah Foster is a beautiful girl, and she might be smart, only she hasn’t done any of homework or reading to really succeed in her biology program. Panic sets in at the last minute when the end of the semester rolls around, but she has a plan. She is ready to get her A. But she won’t earn it. No, she intends to seduce her teacher. She even has a naughty schoolgirl outfit picked out just for this occasion.

She doesn’t know it, but Professor Rider is so much smarter than this cocky girl, and he has a plan for her. Sarah comes to his office, dressed to seduce him. He offers her some tea, and she drinks without realizing it’s laced with a powerful sedative. Professor Rider needs a test subject. He and his students are going to use his new formula.

Their goal? Human modification. Sarah wakes up, naked and caged. Her teacher and classmates start to inject Sarah with a special drug. It enlarges her breasts and forces her to lactate. She doesn’t realize it at first, but Sarah is going to be transformed into a docile milk cow.

The professor’s experiments include more than making her lactate. He wants to find out what stimuli will produce the most milk. Early on, he figures out that arousal makes her a more productive cow. He makes her graze and feeds her grass. He ties her down and puts her on display while other students test her sexual responsiveness. This means sex, anal sex, spankings, and blow jobs. She’ll be the class pet, an adorable moo cow. The more she resists, the more she’ll be humiliated and punished.

Professor Rider just needs to clear one hurdle to keep Sarah. The president of their college will be by for a demonstration. If Sarah can hold out until then, she might be able to earn her freedom. Otherwise, she’ll be her teacher’s permanent milk slave.