The inept salaryman Nanao was caught by his pubescent sisterrina masturbating with an erotic book she had taken from him and was asked to "show me your dick being rubbed". Even though it was his sister, he felt embarrassed as he ejaculated, but rina reflexively took the ejaculating penis into her cheek and swallowed. Later, when his friendkonatsu-chan came over, she also sucked the ejaculating penis! In the end, Nanao was made a toy by the curious innocent girls and forced to participate in their lewd studies...＃班長P
