I was dating an Aupair when I was younger. She was sexually coersed by the husband, and I helped her leave and find another job, she's now doing really well for herself.
It was never sex but, he used to make her pleasure him out of coersion late at night when the wife had gone to bed. They would continue and watch the movie whilst he would low-key cuddle her and persuade her to do the deed. She would then receive gifts from him frequently to keep it their little secret. When we met she told him she wouldn't do it anymore. This is when he turned nasty and started threatening her, that she would be sent back home etc He was worried about her telling his wife.
She showed me the messages and the threats. I wanted her to go to the police but, she wouldn't because she didn't want to be sent back home.. She also didn't see it as him being in the wrong because he wasn't physically forcing her. He would buy her expensive jewellery etc to make her keep quiet. The worst thing is that she loved the children and his wife but, felt trapped. I often think now that she should still report him but, hope karma had its revenge.
She had two other friends aupairing in other houses on this Surrey mansion estate, and they had similar stories. I am sure back then it was a very common setup.
As for the job, she was literally working like a stay at home mum/cleaner. They had 3 kids and she looked after them as soon as they woke up until they went to bed. Cooked their dinners etc and whilst they were at school was expected to clean the house. Most weekends they would ask her to babysit, where she wasn't paid but, would be able to order a takeaway at their expense.
From my point of view she was working as a modern day slave.