My Beloved Mature Housekeeper: Melting Service (2010)

Miyuki Ichihara has taken a job as a live-in housekeeper for the wealthy Kanda family. Whilst enduring the lewd scrutiny of Miharu, the young mistress of the house, Miyuki finds herself developing feelings for her employer, Yasushi, who treats her with kindness. Late one night, Miyuki finds herself eavesdropping on voices coming from the bedroom…