Dahlia's roommate, Katana, drank all the milk again and refuses to replace it! Determined to get revenge, Dahlia slips a pair of headphones onto Katana as she naps, filling her mind with a mesmerizing track to turn her into an obedient, lactating cow. Katana struggles against her bondage and tries to resist her new programming, but finds herself slipping into a deep, horny mindlessness. Once she wakes, she has no memory of what happened, but feels the need to constantly play with her tits, her arousal growing and intelligence shrinking. She grows a pair of cow ears, and then a pair of massive tits, still unaware that anything is different. She goes to bed in the evening and Dahlia plays her reprogramming track again and squeezes and sucks Katana's new, huge tits, stimulating their growth and milk production. In the morning, Katana is transformed into a mindless, mooing, milk cow, eager to serve and provide milk for her new owner.