ひびきは弟と父との3人暮らし。弟思いのひびきは、AVマニアの父を「弟が見たらどうするの！」と注意していた。だがある日、弟は間違って父のAVを見てしまう。SEXとは怖いものと勘違いし、ひびきに泣きついてくる弟。そんな弟の性知識を正す為、ひびきは自らの身体を使い本当のSEXについて教えていくのだった…。
初回1，000円分の無料ポイントプレゼント！
GVG-578 Big Sister's Real Sex Education Hibiki Otsuki
GVG-578
2017-11-01
121分（HD版：121分）
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