[Nisino] My Sister

A conflicted sister, Park Eun‑ji, returns from military duty and finds herself torn between duty and desire as she reunites with her younger brother in a love motel, where a heated encounter with another woman turns into a raw, incestuous threesome. The intimacy escalates, culminating in pregnancy and a promise of marriage, while the siblings navigate their forbidden bond amid whispered vows and lingering guilt. The story arc weaves raw skin‑to‑skin contact, lactation, and a final wedding ceremony, delivering a provocative tale of love, lust, and familial betrayal.