My step-sister, who was born from my parents' remarriage, is a gloomy otaku who is difficult to get along with! What's more, she brought her friends over for a girls' night out today! I sneak a peek into her room and... she's looking at erotic manga with her hidden huge breasts exposed!? Huh? Maybe they all have huge breasts? They're looking at it with such lewd expressions on their faces that I can't help but get a full erection! When my step-sisters notice me like that, their self-restrained lustful natures come out in full force! They surround me with the dirty knowledge they've cultivated from erotic manga and engage in an orgy and continuous creampie orgasms! They take this opportunity to expose their twisted sexual walls and make ahegao faces one after another! They don't care about my dick's convenience as they grind their bodies furiously and writhe in ecstasy! I feel like this is even more extreme than erotic manga...