The first best of the popular series is now complete, in which a virgin brother takes his sister's joke seriously and makes her cum with quickie sex and follow-up piston-like sex! A super luxurious lineup featuring six popular actresses, including Miyuki Arisaka, Mitsuki Nagisa, and Rei Kurumugi! 480 minutes of non-stop climaxes with explosive piston-like sex, without realizing that his sister is cumming!