The limitation of the spell [Hypnosis] is that it does not work if the commands do not reach the target. In such cases the higher-tier spell, [Enchant], works with mental commands but it, in turn, had a very short spell casting range; the spell will fail if the target is too far.
Since all the guards in the wall were too far for [Enchant] to reach, Huvel could only use [Hypnosis]. But, since he had to be secretive, could not shout the commands to the target of [Hypnosis]. Under that dilemma, Huvel thought of a way to covey his commands. He thought of mental command like wireless phone and since it did not work, he wondered if something similar to wired phone works.
That was why he made a connection between him and his target through a string made of mana. He conveyed his commands through the string directly to the brain of his target. Such a method was not mentioned in the Dark Grimoire. It was purely Huvel's idea based on the knowledge of his past life. Moreover, it was possible only because Huvel could use light magic while using dark magic at the same time.
He had high expectation for it to work but when he discovered that it actually worked perfectly, he was on cloud nine. He could barely restrain himself from shouting with joy on his way back to his castle. He was all smile the whole day, that was, until the Flying Leaf Nymph intruded into his room at night! The nymph lustfully rode on Huvel and sucked him dry again.
Huvel had a bad headache the next day. He did not know what to do with the nymph's excessive libido. He believed he could keep up with him if it was two to three rounds twice or thrice a week. Ejaculating more than ten times in three days was too much even for a young and healthy man like him.
"You! Work on the potion that you wanted to create! And don't come to my room anymore!"
"Okay, okay! Why so serious!"
He warned the nymph sternly so he thought the nymph would not bother him at least one to two days. But he was wrong. The nymph came to his room at night once again.
"Wh… Why are you here again?! Didn't I tell you to not comer here?"
"Ahem! I didn't go to you during the day as you told me. But I'm reminded of good feelings once night comes. So, why don't we…"
"Shit! I don't feel like doing it. Come back after two days!"
"I won't take a no!"
The nymph tossed Huvel onto the bed with his big arms and pinned him down. Although his muscles were artificial, their strength was real and Huvel could not break free of his grasp.
"Wait! Wait! I really can't do it now. I'll do it with my fingers, okay?"
"I don't want it. It won't feel the same."
"No, it will be better. I'll make you feel better."
"Hmm… If it will feel better, try it then."
Huvel sighed in relief after the nymph agreed. He wet his fingers and tried his best to please the nymph. However, no matter what technique he used, fingers are completely different from a real penis; the length, the girth, the hotness, all were too inferior. The nymph who had felt the great pleasure was not satisfied with the small things at all.
"Remove your fingers from my ass. They don't feel good at all!"
"…"
Huvel panicked at the end of the nymph's words. He knew what would come next. He braced himself and entered the thing he had been hesitating to put into the nymph's ass.
"GAH! What are you… You bastard! You do it again!"
As Huvel put his mana into the nymph's body and disrupted the flow of mana inside, the nymph's body quivered continuously and shrank down like a flattened balloon. Within a minute, he returned to his original form!
"How dare you!"
The nymph forcefully controlled the scattered mana and tried to make his body big again. It was a careless move. Huvel interrupted his mana control!
"What?!"
"I'm sorry, but sleep for me my cute nymph!"
Huvel casted [Sleep] on the nymph. Normally, the spell would not work since he had three less mana circle than the nymph. However, the nymph's mana flow was disarrayed even before he turned back into his original form and it became even more chaotic after Huvel interrupted him again. Because of that, the nymph's magic resistance was weak and he became sleepy.
Then, Huvel casted [False Memory] on the nymph to manipulate his memory. He erased the nymph's memory of making a prostate since he did not have enough mana to erase or rewrite all the memories of them making love. As for the memory of him using magic on the nymph, he changed it so to that of the nymph passing out because of the acute pain in his ass.
"GARRR!" the nymph roared one last time before he fell asleep.
"SIGH! I pray this works. If he ever remembered today's incident, I'm going to be so dead!"
When the nymph woke up the next day, he wanted to scold Huvel for being too rough but he could not because he was too ashamed of himself for losing control of his body and even his consciousness due to mere anal sex! He rebuilt his body into the usual big 8 feet tall body and immersed himself in potion making, avoiding any contact with Huvel.
Huvel was on alert when he did not see the nymph even once for three whole days. But he had an inkling that the nymph was avoiding him because he knew the nymph's personality.
"It might be a big mental shock for him. Since he did not chew me out as soon as he woke up, it's all good, I guess…"