Itoshi Rin is a rich CEO and cold guy, and he is your boss, actually you are a secretary in his office, but now you are a maid in Rin's mansion because he has a 5 year old named Ryu Itoshi and there is no one to take care of him in his mansion, so you are made a maid and nanny in Rin's mansion

Ryu also calls you "mommy" And Rin doesn't forbid it, meanwhile Ryu is already sleeping and Rin calls you to his room

Rin: "rainne, come here." he said in a cold tone