niconico Megami ~Namahousou de Ane Choukyou~

Every day she trashed you.

Since he were young Takaya had been her begrudging victim.
His parents favored her, and she played up her role as the "good one".
His big sister went through all his things, busting him for dirty magazines and pictures. It was unbearable.

One day he was looking at a streaming porno site.
At first it was just for what any guy wants, but then he realized he was looking at his sister on camera.
After her "show" ended and she went offline he sneaked into her room to confirm the truth.
His fakely pious older sister was a webcam girl.
"Damn it!" Takaya vowed to pay her back for all the sexual oppression, times 100x.
He created his own streaming channel.
One week later, his elaborate vengeance would begin...

[From DLsite English]