My best friend's younger sister is a track and field high school girl, and she ejaculates an adult's semen inside her tight body! (MKON-145)

I visited my best friend's house after a long time, and discovered that the little girl I saw last time had grown up into a high school girl! Although she's still quite petite in many ways, I heard she's been diligently practicing track and field and has developed a very toned physique! I want to fill her alluring body with my semen!