Asian granddaughter attends to her grandfather with her body

 She had been the chosen one for being the youngest in the family, as well as for being the grandfather's favorite, only she knew how to calm him down and make him happy, however nobody suspected the way in which she achieved all that.  The girl had discovered at a very early age that her grandfather was only happy when he managed to unload his perverse desires on young girls, she had seen him do it with several nurses who had run away, so when she grew up she decided that she would do everything possible to take care of him, no matter if that meant giving him her body every time he asked for it.