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

'Understood! The upgrades are ready—now put your hand on Ginevra's heart so I could transfer them.'

Although a mana pool had no distinct position in a human body, instead following its contours, a heart was its approximate center. Cael put his hand between Ginevra's supple breasts and immediately felt a surge of power and a slight vertigo go through him.

Unlike other times, though, this surge went through his hand and entered Ginevra's mana pool. She grit her teeth as her legs wobbled, but Cael caught her shoulders before she could fall.

"Are you alright?" he asked worriedly, at the same time probing her aura for any sign of injury.

Instead, all he could feel was Ginevra's mana pool, increasing in depth and width.

Upgrading a wife