A girl with a gloomy demeanor whispers in his ear, "If we get found out, my life will be over," completely shattering his reason, leading to multiple ejaculations inside her, a climax of extreme stimulation and teasing. (Sarina Hyakuna DSOD-002)

The male protagonist, arriving at his girlfriend Mizuki's house, encounters Mizuki's younger sister, "Sarina." Although Sarina is a cold and aloof girl, she secretly uses lewd words and sexual traps to seduce him when Mizuki isn't looking! Once aroused, she will masturbate or perform oral sex on him until he ejaculates without his knowledge! Sarina's seduction escalates, even leading to sexual intercourse! Under her relentless temptation, his reason completely collapses… and he can no longer stop ejaculating inside her…