A defenseless figure fresh out of the bath. Wrapped in nothing but a thin bath towel, Yuki Suou's glistening skin and quietly matured feminine body were accidentally seen by her brother, Masachika. Struck by an allure that scorched away all reason, the brother retreated to his room to vent his burning lust while envisioning his sister. However, the very sister in question walked into the room without knocking, catching him in the midst of his taboo deed. Seeing her brother's ragged breaths and realizing the raw desire directed entirely at her, Yuki didn't run away. Instead, she smiled provocatively, choosing to accept his heat and willingly cross the forbidden boundary.
Yet, she had utterly underestimated the insatiable lust of an adolescent boy. Once ignited, her brother's hunger knew no bounds; it was no longer confined to the privacy of home. Even in school blind spots—like the student council room and deserted corridors after hours—she was subjected to intense, relentless trysts. Petrified by the constant dread of being discovered, Yuki initially trembled with shame and fluster. But as her brother fiercely claimed her, pouring scorching love and heat into her again and again, her heart and body became hopelessly intoxicated by the thrilling taboo. Precisely because they are siblings bound by blood, their inseparable, guilt-stained passion deepens into an inescapable descent.