Mako-chan Kaihatsu Nikki – Episode 3 (EN)

In OVA Mako-chan Kaihatsu Nikki #3, the fallout from her stepbrother's cunning manipulations reaches its peak. Having already secretly taken Makoto's virginity through coercion and blackmail, he now orchestrates the ultimate betrayal: Makoto's "first sex" with her devoted boyfriend Kaoru. Still clinging to the illusion that this tender moment with the boy she truly loves will be her genuine first time, Makoto approaches the encounter with nervous excitement and genuine affection. She whispers to herself that this is the real beginning of her intimate life with Kaoru. However, after repeated, intense sessions under her stepbrother's control, her body has been conditioned to crave rough, dominant, and forbidden stimulation. Gentle caresses and slow, loving penetration from Kaoru feel disappointingly inadequate—her sensitive spots no longer respond the way they once did, leaving her frustrated and unfulfilled even as she tries to hide it. Makoto forces smiles and moans, desperate to make the experience special for him, but the growing emptiness inside her becomes impossible to ignore. Meanwhile, her stepbrother lurks nearby, watching with satisfaction as his "development" of Makoto proves irreversible, turning what should have been a romantic milestone into a heartbreaking display of NTR corruption and sexual incompatibility. The episode builds to a powerful climax of emotional turmoil, suppressed desire, and the dawning realization that her body now belongs to someone else.