Perfect Secretary: Training Day

Secretaries have all signed waivers, permitting the staff to treat them roughly sexually as part of their training. The whole BDSM world gets quickly mocked as the girls are handcuffed (and one even gagged) at their desks, ordered to copy a letter by hand in an hour, forcing each one of them to use a pen in her mouth (no hands), including the gagged girl after it's been removed.