Becoming Siblings With The Protagonists

Cynthia is the real daughter of Duke and Duchess Verlice, she is also known as the bro-con villainess in the novel [We're Not Real Siblings]. While the heroine, Sienna, is only an adopted daughter. Cynthia first liked Sienna, but gradually after she found out that her brother, Aiden Verlice, the male lead, started to have feelings for Sienna, she turned like to hatred. She was obsessed with her brother to the point of almost committing a crime. Because of her crazy bro-cones and her behavior towards Sienna, Aiden started to dislike her too. In the end, Cynthia was brought to an asylum (mental hospital), where she died a tragic death by committing suicide.
'So... Why am I that crazy bro-con villainess!!!? I didn't ask for this!! and also the supposed male lead and female lead, are doting older siblings!!! And are nothing like in the story!!!'
"Tia, older brother shall accompany you for today."
"Oh! Brother Aiden~!! Tia will come with me!!!! Now, do your Ummm... stuffs first that aren't related to Tia!!"
"Sienna Verlice, 'I SHALL ACCOMPANY' Tia for today, understand? Now I remember, you still have classes this afternoon right?" *menacing smile
!!!
"You..."
*crackle
'Wait... why do I feel like there are sparks flying? I'm just going to the library!!! Aren't you two supposed to be all lovey-dovey!!?? '
"Cynthia, I like you"
'Huh!!!??'
'And why is the second male lead confessing to me!? This doesn't make sense!!! Are there loose screws in your heads!!!??? Shall I fix them all for you!!??'

*Cover Picture Not Mine #CTTO*
A/N: This is my original story and i hope you all enjoy reading it! ପ(๑•ᴗ•๑)ଓ .