[ClockLord (Suzushiro Nerita)] This Guy is NOT my Boyfriend!! ~The Shinomura siblings: Natsuki side story~ [Rupee]

A conflicted Natsuki, the sole female of the Shinomura siblings, wrestles with the shocking realization that the intimate advances of a male figure—who claims he's not her boyfriend—threaten to upend her familial bonds and personal boundaries. As she confronts the rapid escalation of desire, the tension between sibling loyalty and forbidden attraction builds, leaving her torn between resistance and surrender. The story unfolds through whispered doubts, urgent touches, and emotional turmoil, promising a tense, erotic exploration of sibling dynamics.