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Aoi’s feelings develop into jealousy at first, as Genya went an extra mile to serve the corps while she was too much of a coward to continue on that path. The Tanjirou effect is taking too long to work.
When his situation became suicidal rather than a sign of bravery, she confronted him. Genya is startled by this sudden treatment of the girl; he can’t look her straight in the eyes. But as she keeps rambling, he snaps back verbally, which flusters Aoi. She tries to keep her posture, but the tears flowing out of her eyes betray her, revealing her vulnerability. She leaves the scene and does not attend to Genya for the rest of the day. Genya hates himself for snapping at her, especially being Kochou’s sister or whatever this is supposed to mean. Aoi, to his surprise, comes the next day to attend his recovery nonchalantly, but effectively as ever. He would love that silent treatment if it weren't a consequence of an argument.
And so he hops on his next mission, leaving his pages with Aoi tainted till he comes back with arms he is unable to move. Eating too many demons and regenerating his torn arms has tired his biology.
For now, he is paralyzed, he can still use his arms but not at the moment. How will he eat? Aoi feeds him, as the head nurse. If he hadn’t tainted his pages with Aoi and Kocho, he’d ask for a male companion to attend him, but it is no use; no word can top Kouchou's orders…
Aoi feeds him, blows softly over the steam coming from the spoon, and wipes Genya’s chin, and blood flows into his eyes. He turns his face away aggressively, and Aoi closes her eyes, takes a deep breath," There is still the medicine." She puts away the bowl of stew and picks up a cup of that stinky hot medicine from the tray "and then we are done".
Hasn’t he learned his lesson? Snapping at others and hurting them, but they will always kill him with their kindness… Or is she just doing her job? Even so, she always shows up—no matter how whiny the patient, no matter how much they resist—and startles everyone with her composure.
Too lost in his thoughts, his lips don’t welcome the next flaming hot cup of medicine that’ll pour over his neck and chest, making Aoi panic as she wipes and apologizes.
Genya is unaware if he is fevered from the hot liquid burning the skin he is unable to regenerate, or from his last thoughts… he opens his mouth looking straight into Aoi's terrified eyes and says
“I am sorry"