IENFA-35802 A high school girl who pitied my useless self promised to let me do 'so-ko' (frottage) just by rubbing, but we both felt too good and her pussy got so wet! So I slipped it in! "Eh? It's inside?" But I couldn't stop and ended up cumming inside!

The younger sister who attends an all-girls school is sleeping with her panties fully exposed. The brother, excited by the sight of his sister's bare-assed state, immediately grabs his dick and starts jerking off. However, he is quickly noticed, and the brother, who lusts after his sister, is labeled a pervert. But gradually, she starts to feel sorry for him. She offers to help, but the brother can't seem to cum. The sister, fed up with waiting...!