Excited by a prank from her uncle, the silent, super-M flat-chested niece, Ichii Yuuka, KTRA-537

Ketsuka is a somewhat shy girl with glasses. Today, she went to her uncle's house to run an errand. After entering the room, her uncle agreed to give her a massage. However, his actions became increasingly lewd, touching her breasts and private parts... For some reason, Ketsuka felt excited and her heart raced at her uncle's lewd behavior. Before she knew it, she had given her body back to her uncle and was being mischievously played with by him...