I Stopped Fighting, She Panicked

Abandoning a foster sister who stole their life causes her to panic.

The narrator stops paving the way for a foster sister who claimed their existence, sending her into a panic.

• family
• revenge

1. Narrator quits supporting foster sister
2. Sister stole narrator's life
3. Sister panics when abandoned

Readers who want a quick reversal where a long-exploited protagonist walks away and the manipulator spirals.