NHDTA-203 New Year's Problem: I went home for the first time in a long time, and when I tried to take a bath in the morning, my younger sister, who had grown cute, was taking a bath! In addition, he innocently invited me naked, saying, "Let'

A series where the temptation of a younger sister confuses a man. When I tried to take a bath in the morning at my parents' house after a long absence, I encountered my sister. He asks me to go in with him, but I try to refuse because it's already time for my relatives to wake up. However, my sister, who is curious about the man's body, boldly invites me to sigh. The crotch is erected though I think that I should not put out my hand. Can you keep your sanity?