For some reason, stewardess Yui enters into a mistress contract for the first time. She is confident that she can satisfy her partner as a mistress better than the average woman, but... [Contract-established sex] With a mixture of confidence and anxiety, she follows the intermediary's instructions and meets the man for the first time. [Teasing and repeated orgasms] She is restrained in an M-shaped position and tortured with a vibrator. [Gangbang extending the contract] Surrounded by strange men, Yui looks anxious. Her body has already become unable to refuse the mistress contract... [Beautiful flight attendant reduced to sex slave] She spends her days being trained as a sex slave... She has become completely willing to serve him and indulge in pleasure.