I saw a neat scenario in a book called 'Sex is Fun' where a wife writes a note to her husband saying she has to ask for a raincheck on their night out, but she has hired a maid to do anything for him. When he gets home the wife greets him in a french maid outfit and hands him the note. She tells him she was hired to satisfy his needs. She serves him his meal at the table and intentionally spill water on the floor, so she can bend over to clean it staying out of reach. Later bring back the pitcher of water, but this time spill on his lap, so she can help dry him. I will let you use your imagination from there.

I like the idea of role play, and it would be great to hear about others. The schoolgirl/teacher seems like another classic.