SleepyGod

Getting girls, is such a normal task, but it is almost impossible when you have to cope with being the weakest student in your academy. Ryan Whitemane was a youth with almost no chance of getting a girl until a strange book met him. 
Now, with the help of a Succubus, Whitemane can easily understand a girl's feelings, what they want, and what they don't know they want yet. The more he loves, the stronger he is.
But every pact with a demon has it’s costs, right?
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- Chapter Length, around 1K-1,5K words
- Release Schedule will soon be 2Chapters a day 
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My Succubus Harem System

"Take a deep breath, your mana is being introduced again" Ryan approached Sylvanna and placed one of his hands on the girl's back. Her body was hot and wet with sweat, she was shaking and panting, slowly losing her breath.

"That's it, take a deep breath" Ryan said, guiding her.

The two cubes that had been holding her mana were now replenishing. The speed of withdrawal and replenishment was increasing, and before long it became so fast that the process of withdrawing and placing energy was occurring hundreds of times per second. Her mana slowly approached zero and returned to full capacity, this caused the curse of eternal fatigue to weaken as for a few seconds, Sylvanna's body reached zero mana.

[Bonus chapter] 110 - A strange crystal