JK-style younger sister brought a middle-aged man to her room, and I secretly witnessed their meltingly perverse sex... Kuramochi Akane APAK-100

Unbeknownst to her brother, Xiaoqian's body had matured, and she had learned about erotic things. She even brought a middle-aged man older than her brother home. Thinking her brother wasn't home, she began engaging in lewd acts with him in her room. Her brother, pretending not to be there, secretly witnessed their sexual activity and became aroused. Xiaoqian took action to silence him…