I was living as a shut-in when my younger sister, who's into sports and plays tennis, came back home. After not seeing her for a while, I was shocked by how much she'd grown—especially her huge tits. My heart pounded, overwhelmed with adoration for her. She accepted me with an ahegao expression, stirring my emotions even deeper. Watching her get taken by her school teachers, climaxing over and over with that same pleasured face, only made me jerk off even more. I still can't forget the way I felt back then.