It seems there's a legendary nurse in this ward who uses deep throat oral sex to extract semen from patients by sucking and swallowing their penises. (Yui Maro START-235)

In a certain hospital, male patients were spreading rumors: "There's a legendary nurse in this ward who can give you orgasms with oral sex." "Impossible (laughs) But if it were Yui, that would be great..." From that day on, they would be drained of their semen by the legendary nurse Yui through oral sex.