Brother slid his beef whistle into his sister's vagina by spreading her backside

Coming out of the shower, the little sister in one towel complains to her brother about back pain. The caring relative is ready to help his sister, so he starts massaging her. He kneads her neck and back with his skillful hands, but accidentally throws off his sister's towel. Seeing her naked body, the brother is so turned on that he puts his long organ deep into the fragrant, wet vagina.