Sweet moans are coming from the next room... When I peeked in, I saw my cute little sister masturbating!? I hadn't noticed before, but she had grown into a woman's body sometime without me realizing... She awkwardly plays with her pussy, gradually reaching climax. The brother feels aroused by his sister's unguarded self-pleasure... Even knowing it's wrong, he can't help himself and stealthily approaches his sister who is masturbating.
