Maid in Heaven / Maid in Heaven SuperS

The main heroine is a very sweet and, for the time being, modest young girl. At the beginning of the story, she gets a job as a maid for her best friend, who is her secret love. To please him, she does absolutely all the work typical of a maid and also satisfies her master's sexual needs. And the guy himself treats her only as an object of desire and doesn't perceive her as anything more than his sex toy.