For Hire: The Favour

I've been made into a big-breasted sissy shemale by my wife and her friend, Mrs MacLean. Dressed in my short frilly French maid uniform I look after the house while my wife goes out to work. But she's now begun putting me to work - hiring me out to whoever wants to pay for me. To do whatever they want with me. Tonight, as a favour, I've been hired out for free to Mrs MacLean. She's even given my wife the clothes I'm to wear.
But why does she want me to look like a hooker and wear a chastity cage?What further humiliation is in store for me?