DMAT-187 I caught my sister masturbating...

Sweet moans are coming from the next room... When I peeked in, my cute little sister was deeply engrossed in masturbation! I hadn't noticed before, but she had somehow grown into a woman's body... Awkwardly playing with her pussy, gradually reaching climax. The brother felt aroused by his sister's unguarded self-pleasure... Even knowing it was wrong, he couldn't help himself and stealthily approached his sister who was masturbating.