A stern mistress welcomes her new bi trainees, promising no mercy as she torments their untouched holes. She starts with a degrading inspection, fingers, and toys, pushing their limits. Then, she introduces her massive strapon, fucking them relentlessly, switching between their eager asses and pussies. The trainees squirm and moan, but she's unyielding, determined to turn them into her bi-sexual playthings.