Sienna felt like her vision had been shattered into many pieces when Eren crushed her heart.
She was too stunned to continue resisting. And she was too afraid to show signs of trepidation on her face. A series of images started appearing in her head as she started living her life in reverse.
Deception. Manipulation. And dominance through family background. Sienna used these traits as her go-to tools to achieve her goals. And her position in the family allowed her to do that without facing any repercussions.
However, just as Sebastian had said to Eren in passing, she wasn't like this from the beginning.
Sienna started remembering her happy days. The days of her early childhood made her stand out from the rest of the Slughorn scions. Her talent started becoming apparent as she began training to become a ranker.