エロマンガ好きの陰キャなオタク義妹とその友達がボクのチ○ポで脱二次元乱交！突然出来た義妹は全く打ち解けられない陰キャ！だけど義妹の頭の中は…

My suddenly-formed step-sister is a geek who can't get along with anyone! Naturally, all of her friends are geeky geeks too! My step-sister's mind is on the verge of bursting with naughty fantasies! When she accidentally sees my erection, she loses herself and asks for my dick! When her geeky friends find out about it, the dirty knowledge she's cultivated from erotic manga erupts, leading to an unexpected orgy and high-tension continuous cumshots! She makes ahegao faces, double peace signs, and other excessive reactions to erotic manga, and is a total pervert! I'm at the mercy of these step-sisters!