Oni Chichi Harem, おにちちハーレム
Oni Chichi Harem 4

Noboru Amakawa finds himself in a surreal paradise when Kirika assigns him the daunting task of impregnating 10,000 demon girls in a village where voluptuous desires run wild. The women, cursed with ever-growing breasts and insatiable lust, lose control as their bodies transform, their horns marking their descent into primal need. Amidst an ocean of flesh and unbridled passion, Noboru surrenders to the endless ecstasy, each encounter more intense than the last.