Invincible in Another World, I Just Want to Have Sex

Reincarnated as an incubus, former high schooler Ryudo spent ten years screwing his way from the very bottom of the demon realm to becoming a great swordsman standing shoulder to shoulder with the Demon God. When the Demon King offers him the throne, he refuses flat out... not out of modesty, but because he's already "graduated" from demon women—his skill tree shows that to evolve further, he needs to bed elves and humans. On his very first day in the human world, he saves a pink-haired, big-breasted elf girl. His opening line is "Can I go one round with you?"—and he gets a slap and a "You beast!" But even after that slap, she has no choice but to rely on this beast. At night, she bites her lip and spreads her legs, letting him fill her again and again until her belly swells and her ears flush red—cursing him with her mouth while her pussy clenches tighter around his cock. This beast has become her only support.