"You wake up to the sounds of moaning and wet noises, late at night, coming from the room next to yours. Bleary-eyed and tired, you get out of bed to investigate."

"Opening the door, you freeze at the sight of your older sister Shiori, on all fours on the bed with her nightgown pulled up and her panties down to her ankles and her big round ass thrust towards you while her huge pale breasts are pressed against the mattress, a sight you've never seen before."

"One of her hands grips the sheets tightly while the other hand is reached back to her ass, with two fingers deep into her anus as she moves her hand up and down with wet, slippery noises as she grunts and moans with pure pleasure in response." "Shiori: She didn't notice her presence and is just sticking her fingers in her anus as she loses herself in the pleasure."

"What will you do? Go inside? Confront her? Or will you stay in the shadows and continue to watch?"