IENF-243 A high school girl who pitied my pathetic self agreed to let me do 'so-ko' (frottage) with the promise of just rubbing. But we both got too into it, and her pussy became so wet! So I slipped in. "What!? It's inside?" But I couldn't stop and ended

The younger sister of a female school student is sleeping with her panties fully exposed. The brother, excited by the sight of his sister's panty-less state, immediately grabs his dick for a jerk-off session. However, he is quickly noticed, and the sister treats her lustful brother as a pervert, but she gradually starts to feel sorry for him. She offers to help, but the brother can't seem to cum, so the sister loses patience...!