[wzashine (bibi)] 姐妹战争 | Sister War

An older sister, once an orphan taken in by the family, exerts strict control over her younger sibling, who resents being treated as inferior despite the father's favoritism. The tension escalates as the sister binds, gags, and threatens to extend the younger's confinement, while the younger protests and pleads for mercy, exposing a volatile power struggle within the household. The story unfolds through escalating domination and defiant resistance, promising a fierce sibling war of dominance and submission.