Lately, I've found myself getting excited by even the smallest gestures and mannerisms of my younger sister. As a NEET, I always spent my time lounging in the living room, but one day, my sister came home earlier than usual. She didn't stop by the living room and went straight to her room. Changing into her loungewear, she stood in the changing area facing the mirror, striking some strange pose that caught my eye. Curious, I peeked in and saw her strip completely naked, then start masturbating in the bathroom. I couldn't contain my arousal and rushed into the bathroom where she was. While washing her mature body, gently caressing her skin, I finally had sex with her. At that moment, both my mind and body reached their absolute peak.