"Uncle, please... don't bully my sister... I'll protect her." Shion, a sister who cares deeply about her little sister Moe and has a strong sense of justice. Knowing this, the perverted uncle threatens to touch Moe if she doesn't do what he says... Shion stands up to him, determined to shield her sister. Desperate to help Moe, Shion agrees to anything that might make Uncle happy. She shakes her ass and gets dosed with some kind of stimulating medicine that messes with her thinking... And then, Uncle takes advantage of her helpless state by brutally fucking her and creampie her without mercy while shooting his load deep inside her womb.

「おじさん、お願い…私の妹みおんをいじめないないでください…。（私がみおんを守る。）」妹思いで正義感がちょっぴり強い姉のしおん。そんな性格を知り逆手にとった悪い叔父さんは妹みおんに手を出すと脅してきた…。姉のしおんが盾となり必死に庇う。妹を助けたい一心で叔父さんを喜ばすために腰を振りまくり、元気になるお薬を盛られて思考回路がぐちゃぐちゃに…。そして叔父さんにめちゃくちゃに犯●れ続けられ中出しされてしまった。