Heart Mark Oome.

Reika is a dedicated erotic manga artist who relies heavily on her step-brother, Yuu, for daily support as she works tirelessly to complete her manuscripts. While she remains focused and disciplined during the creative process, finishing a manuscript triggers a drastic shift in her behavior. The intense experience of illustrating countless explicit scenes leaves her body deeply aroused, eroding whatever restraint she once possessed. Once her work is submitted, Reika completely surrenders to her awakened instincts. She transforms into an uninhibited force driven entirely by desire, launching herself at Yuu without hesitation or warning. Her pent-up energy manifests as an aggressive, relentless pursuit, as she seeks to exhaust him through every intimate act imaginable. Yuu finds himself entirely defenseless against his step-sister’s overwhelming advances. There is no opportunity to resist or escape her insatiable demands, leaving him trapped in a cycle that repeats with every completed manuscript. What begins as a quiet, supportive household quickly devolves into an inescapable situation, where Reika’s professional dedication inevitably fuels her uncontrollable personal appetites.