I, Lemon Tanaka, Who Was Seduced By Her Sister's Mockingly Cute Tongue Kissing.

瞒着女友去参加联谊…那里有个超级漂亮的美女。几天后去女友家玩时，发现那天联谊的美女就在那里。姐姐趁女友不注意，对我伸出舌吻诱惑。因为舌技太舒服而屈服于诱惑…我抛下女友，陷入了姐姐浓烈的舌吻性爱泥沼…