While her brother is asleep, the sister secretly attempts to practice putting a condom on his morning-erect penis. When the brother catches her in the act, she says, "I'll cooperate, so let me practice," and brings him to climax by giving him a handjob while letting him grope her breasts. The aroused siblings, driven by desire, use sex practice as an excuse to penetrate, crossing the line and ultimately committing incest. This work is an excerpt from "Letting My Little Sister Practice with the First 3cm: A Near-Incest Daily Life with Aoi Kurugi" (Product Code: dvaj00371).