Transmigrated into the cannon fodder younger sister of the uke in a BL novel

[1vN popular with thousands + slightly forced competition + fake gay-to-straighten + lots of commentary]
You transmigrated into the body of the cannon fodder younger sister of the uke in a BL (Boys' Love) novel, a character suffering angst.
You have a heart condition, and strangers in the live chat mock and despise you. Later, you'll even die because of the tragic love story between the main characters.
Your death will become the motive for the uke's descent into darkness.
After that, there were hundreds of chapters of a sadomasochistic relationship between the main characters, and no one remembered you anymore.
So you're just a plot device.
But you are not resigned to it.
So in order to survive, you deliberately sabotage the plot.
After watching it again and again, you eventually see a terrible plot, a barrage of comments that break your spirit, and two opposing characters, one a dominant and the other a submissive.
Are you satisfied with this?
But what you didn't notice was that, out of your sight, the gazes of both the top and bottom were burning and sticky, each one wanting to pounce on you.
Especially your submissive older brother, who takes off his gentle mask in front of you, his eyes swirling with emotions you can't understand.
Brother, do you want to break up with me too?
Third-person perspective in the main text