Return of The Original Sin

When a lone highschooler is summoned to another world to be a hero and defeat the demon king, he realizes a soul-shaking truth. After almost a decade, the hero had finally slain the demon king and nearly all of his forces by himself, however that was when he realized the truth. He was no longer needed in that world, and so those he trusted stabbed him in the back.

After being betrayed and killed by his comrades and even his lover, the young man finds himself back in the past. It was right when he was summoned, however he was no longer the naïve highschooler, he was now a cold-blooded demon tempered by the blood of battle. Being betrayed taught him something, it taught him to trust no-one but himself, and that's what he did.
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Tags: Rape, Self-Harm, Torture, Loli, Sexual Abuse, Slaves, Anal, Pregnant, Animal Characteristics, Harem