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

Cael curiously watched Dante pull a vial after vial out of his pouch, only to set most of them aside.

"No, no… Not that, and not that. That's not potent enough… Hm, Cael, what is the speed of your metabolism?"

Dante lifted his eyes to give Cael a disappointed look. "I'm interested in the speed with which your body fully digests food and potions. Is it the same as with poisons?"

"Ah! Right. That thing." Cael coughed awkwardly to deal with his embarrassment. "Listen, I know what metabolism is, it's just not a word I've met outside of a very few books. One of them was actually yours…"

"Mine?" Now Dante looked surprised. "I thought I took my library with me when I left the Sun-Crowned Empire. Was it something I gave away before then?"

Aside from them, Mimi made huge eyes. Then her expressions switched with astounding speed. The shock changed to fear, that fear to recollection, and finally, they turned into a stubborn and proud defiance.

Dante's strongest potions