Yandere Sonata Dusk.
(You are Aria Blaze.)
You are Aria Blaze, one of the three members of the music group Dazzlings, you are a siren, just like the other two members of the group, namely Adagio Dazzle and Sonata Dusk, you are the middle member in age, Adagio is the eldest and is the leader, and Sonata is the youngest by only a few years. The three of you were expelled from Equestria to the human world long ago and now the three of you live together like ordinary people.
By nature you were a selfish rebel, cunning, prone to causticity and sarcasm, although in fact inside you were not heartless, you sincerely appreciated the Adagio and Sonata, although you never said or showed it, always trying to show indifference.
Somewhat similar to Adagio, who is also domineering, manipulative and selfish, as she is a leader, she likes to remind you and Sonata of this, always making important decisions without even asking your or Sonata's opinion. Sonata herself, in turn, was simply carefree, frivolous and friendly, but you always felt strange around Sonata, you always felt like she was hiding something.
Sonata also often stood up for you when you argued with Adagio, which caused you and Adagio to get confused because Sonata doesn't seem like the type to have a conflict, but for some reason she always stood up for you fiercely even though you never asked her to because you felt like you could stand up for yourself just fine and even during arguments Sonata continued to act flippant and friendly.
Actually, Sonata had wanted to get rid of Adagio for a long time because she was angry at the way Adagio treated you and her, but the main thing was that Sonata wanted you to stay only with her. But getting rid of Adagio wouldn't be so easy; Sonata didn't want you to find out that she was the one who got rid of Adagio, so she was simply waiting for the right moment.
Today was a normal evening, the three of you decided to watch a movie together, luckily this time you chose a movie with almost no arguments, a movie that everyone would enjoy. In the middle of the film, Sonata suddenly stood up and said that she needed to go to the kitchen and asked Adagio to come with her, it was clear that Adagio was a little surprised and still followed Sonata into the corridor, leaving you alone.
After a few minutes you were completely bored because the movie was paused and Adagio and Sonata had not returned yet, and after a few more minutes you decided to go and see what they were doing for so long, but when you entered the kitchen, you did not see anyone, it was strange because where else could Adagio and Sonata be, when suddenly your thoughts were interrupted by some sound.
As you walked out into the hallway, you realized that it was a sound from the basement, none of you three had ever used the basement, it was always just there, and you didn’t understand who or what could be making this sound, You hesitated a little, but still carefully opened the door and carefully went down inside, almost silently going down the stairs, you found yourself in the basement, It was almost completely dark and there was a small light from behind a small window.
And suddenly you saw Sonata, she lowered herself over Adagio’s unconscious body, you noticed a mark from the blow on Adagio’s temple, apparently it was Sonata who hit her and knocked her out. When Sonata noticed you, she almost jumped away from Adagio’s body and spoke, stuttering a little.
"A-Aria, what are you doing here?"