Hey, /r/! Looking for a specific doujin. Its based on a girl

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113KB, 670x934px

Hey, /r/! Looking for a specific doujin.

Its based on a girl and her super genius older sister. The younger girl wakes up to her genius sister having given her a huge cock. She cant control it, and goes to school embarrassed with it. She jerks off in class and gets very nervous, and cums into her schoolbag.

Her genius sister then finds her in the hallway, and once Mrs. Genius confronts the futa sister, the futa gets upset and says that its all genius' fault, and the genius should pay for her actions and starts fucking her forcibly. They then go to an empty classroom and continue, where the older sister gets more and more ashamed about how hot it is to be the submissive. Its an insant-cum level of lewd niche for me and this one is perfect. I cannot find it atm, thanks for any help!