SNIS-397 I'm going to get raped. ~An older sister who loved her younger brother~ Tenshi Moe

An angel goes to be raped himself...The price he pays for protecting his younger brother's life is an angel's body. She is stripped naked at the will of a man who enjoys perverted tastes, tied up with hemp rope, and teased while her own masochist awakens. As I was writhing and losing myself in the pleasure of being humiliated, my younger brother Yuta appeared in front of me... and I was raped right in front of him...? No, a reality even more outrageous than that attacks Moe.