OBA-299 A mature delivery lady, Mio Morishita, who gets horny from an erection and can't help but have real sex.

Mio lives with her husband Hiroyuki. Hiroyuki's salary is not high and life is by no means easy, but Mio is living a peaceful life. However, something happened, and her emotions in Mio came to the surface. "I want to have a little luxury too..." And Mio started a part-time job, a mature woman delivery health lady. Whether this was her vocation, Mio gradually stands out. However, Mio's has reached the maximum because of her sex without real performance.