Penis training: This won't work. If you ejaculate prematurely, you're ruining your baby! My sister and I are worried about my premature ejaculation being discovered by my sister. She says, "Brother, you need to improve your premature ejaculation!" and helps me masturbate every day. (Nagino Suzu SVGAL-012)

Rin lives with her older sister and her husband. Kind-hearted Rin uses her own body to train her stepsister to help her stepsister, who suffers from premature ejaculation. Sweet kisses and nipple play, clumsy but selfless masturbation… Rin's alluring body makes her stepsister's penis unbearable! Unable to resist his stepsister's tight vagina, he ejaculates inside her! Later, Rin also becomes addicted to her stepsister's penis, pleading every day… "It doesn't matter how many times I ejaculate!"