The advertisement may have...
The advertisement may have said Assistant, but your actual role is office chastity toy. You're here so the women can ease their frustrations by teasing you, humiliating you, or having you go down on them during boring meetings.
Your dress code is that you will wear nothing but a chastity cage, which will remain locked. Yes, outside of work hours as well. I have the only key and I will decide if your performance merits reward, on a quarterly basis.
Welcome to the team, toy. Now, strip and begin your duties.