Arriving in Tokyo to stay with two older sisters, I, their younger brother, found myself completely naked before them, an irresistible temptation that pushed my willpower to its limit! (Kisaki Alice, Yuuki Rino, MKMP-480)

The younger brother is temporarily staying with his two older sisters in Tokyo to prepare for his big exams... but his sisters are often seen completely naked at home! It seems they've liberated themselves and become naturists without parental supervision! Seeing their nakedness makes the younger brother's penis erect...