KuroiBara's Manga

FL ended up becoming Roxana Agriche, whose father kidnapped the heroine's brother. The Agriche was a family who showed no mercy to even their own blood. The heroine's brother, Cassis Pedalian, eventually ended up becoming her toy but instead of torturing him, she chose to save him in order to save herself in the future. Years later, Roxana finally starts her long awaited plan.

Rachel ended up in a BL novel that she was reading for the past 3 years. It ended abruptedly with the death of the main characters so she left an angry comment for the author. The next thing she knew, she woke up in the world of that novel in the body of the sister of the ML.