Garessta

In this world riddled with strife, where even kids know spells, and powerful mages are nobility, Cael was born with no mana at all. An heir to the family of mages, he was his father’s disappointment, and his city’s laughingstock. But who knew that he had a much different destiny? To prevent a looming catastrophe no one else knows about—to stop the Starspawn. 

“Blood Mage System activated. Greetings, user. I am your Blood Mage System. Consume the blood of powerful creatures to purchase new abilities.”

With that power, Cael will become a hero able to stand against the fate that crushed countless others—even if the world will call him a demon instead.

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Although the novel has a harem and r18, neither are the focus of the story. Cael only has very few (2 right now and at the moment I don't plan on increasing this amount) girls, and there aren't that many r18 scenes. Take that as you may~

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My Blood Mage System

Long tails, four legs, wide bat-like wings, scales that shone in the sunlight like polished metal… Lizard-like snouts with mouths full of razor-sharp fangs, and eyes that held wild ferocity and human intelligence.

Dragons. They were dragons—and not at all like the swamp dragons Cael saw before. He only heard about dragons like these from the stories. "Noble" dragons, they were called, because of how their scales shone and because of their immense power!

The dragons finally landed a dozen meters away from the group of travelers in a triangle. Although from the distance they appeared tiny, in reality each of them was five meters tall, towering over the humans like a house.

Each of the three dragons looked very different, like they didn't belong to the same species of dragons.

The leftmost one had smooth golden scales, and a head topped with horns that created a crown-like circle. He looked almost like a king and had a regal stature and haughty eyes as well.

The Emperor's guardians