[Imitation Moon (Narumi Yuu)] There's Nothing Left Of Me From When I Was The Black Knight (Sword Art Online)

Kirito's life as the Black Knight ends the moment Asuna—hung, smug, and utterly in control—collars her drunken, gender-flipped former hero and decides he'd make a far better girl. What follows is a relentless breaking-in: the futanari knight drills her new pet into drooling, ahegao obedience while training away his manly speech, denying every climax until he begs to serve her, Leafa, and Sinon as their willing slave. By the end, the swordsman is gone entirely—renamed 'Kazuha' and eagerly wondering what her real-world body will become once the transformation is complete.