[kuro inu sha (Inumaru)] The female demon king becomes the dog of the reincarnated hero [MTL]

The world's strongest female demon king finds herself completely outmatched by a cheerful reincarnated hero and his cheat skill Training Lv99, trading conquest for collared obedience. The dark-skinned, wildly busty wolf-eared queen with her twitching tail and heavy, sensitive breasts learns to love life on a leash, drooling and desperate to lick, kiss and please her small young master through every humiliating lesson. What is framed as intense peace negotiations lasting until dawn becomes an addictive spiral of pet-play surrender, where resistance proves futile and every sticky, overwhelming reward only deepens her devotion.