A castaway ends up on a remote island where he is found by a kitsune, on this island kitsune have been hiding away from humans for century. The princess takes interest in the humans and wishes to marry him

A maid serves her master well as his hand maid, but he is married yet he does not love his wife, but is in love with his maid.

In a mixed genders prison a female is cellmates with a male who takes advantage of her and makes her his (A darker themed one, may include stockholm syndrome)

A prisoner guard and prisoner fall in love

A kitsune was found by scientists and taken to a lab where she is kept quite comfortable in order for them to research her and one of the lab technicians falls in love with her.