HHKL-042 - Still developing, defenseless little sister in a tiny studio apartment...

Living in a cramped studio with my defenseless, still-developing sister. Her body is just too distracting, and my patience has reached its limit. I gave in to my urges, forced myself on her, and finished inside. I thought I ruined everything, but she got addicted to the feeling and now she's begging for it every day.