A detailed explanation of the three semen ejaculation patterns that make your penis feel good, with a thorough lecture on how to caress! Natsuki-chan cums while being taught how to massage her F-cup breasts, how to peel her clit, and how to finger her! Things to be careful of during penetration, mutual masturbation that gets you excited visually, and what is relaxed sex that allows you to enjoy the time of penetration? A current medical student will teach you about 'really pleasurable sex'!