Tenshi to Akuma no Aida
Engaged to brother #1, but brother #2 is blackmailing her into sex. I usually hate cheating stories, but this one is different. They are both nice to her. The story has a secondary story to it. The relationship between the brothers is explained, and I like that the story is so short. I know I must be crazy but I really liked this. Especially the ending.
Osananajimi wa Ichi Tamagosei no Shishi Supadari Futago to Torotoro 3 nin Seikatsu
All childhood friends. She is "trapped" into living with the twins, who pleasure her as many times as they can, because they have been waiting for her love. Threesome sex. The scenes are ok, the circumstances are hot.
Watashi to 3P Shitekudasai