She didn't understand.
The more she got to know him, the less she truly understood him as a person. So she watched him, she didn't have a choice but to travel with him for her own safety, but she made the choice to try and get to know him. She had sex with him because he was powerful, and the child between them would be even more so with her blood in the mix. He mentally broke her, but then he fixed her. A vampire slave that would never argue back against him would have been a major boon, but he still decided to fix her anyway instead of leaving her a broken husk.
She was broken for a week.
To most people, that would mean that it took a week for Naruto to fix her.
She knew that wasn't the case.
Naruto didn't take a week to fix her, but instead he kept trying to fix her for an entire week. He kept trying and failing to save her mind, and as much as he claimed it was so that he could know what a mind break was like, she could tell that was not the truth completely.
'He just doesn't make sense.' Elmenhilde thought as she looked at his notebook while he slept.
Dozens of potion mixes, all for the purpose of fixing her mind. So many of them were crossed out, showing that he had tried and failed many times. She would have never known if she didn't ask herself questions. He was a genius, well many thought him a genius. Fixing a broken mind had been hard for him, and the dozens of failed attempts in his notebooks showed her that he had been trying for awhile to fix her. He pretended that it was easy, and he pretended that he was okay, but he had been exhausted. He went back to work sending materials to his partner somewhere else in order for him to appear like he was perfectly fine.
Naruto was dead tired and asleep.
Even as Asia had been getting fucked, he only claimed that "he trusted Xenovia did a good job" and went to sleep. He was recording the fucking at the time, but the fact remained that the last time Asia did something similar of her own will, Naruto fucked her until her mind broke. He got insanely horny watching Asia, and then took that horniness out on her.
"Ow!" Elmenhilde hissed as she experienced a shock when she tried to turn the page in the notebook of recent experiments. She noticed a tiny magic circle was scribbled into the corner of the page, so she bit her lip and tore the edge of the page enough to break the magic circle. Her fingertip was burnt slightly from doing so, but she just sucked it as she flipped to the next page.
She looked at Naruto with her eyes softening for a second.
It was the successful attempt.
Restore the Dead's Mind
Use this when you revive Mom and Dad idiot, putting a soul in a freshly created body can break the mind. Use this potion to restore their minds.
"... this potion..." Elmenhilde looked at the ingredients on it. Naruto had not just used a potion to restore her mind, he used the strongest possible mind restoring potion on her thanks to the fact she was Undead. She was an immortal vampire, and undead nightwalker. Only the most powerful restoring potion was capable of restoring her broken mind. She looked at the ingredients, before she remembered the crystal ball. "That sex monster... but one of the ingredients he used to restore my mind..."
Naruto had used a now completely extinct species of plant ingredient in order to create the cure for her mind, meaning he would have had to give up something extremely precious to him. His options would have been to find an extinct plant, rediscover it, or make it himself. The Pitcher Boiler was that monster, while it would seem to be a plant monster at first glance, a mere sex monster, it was more than that.
Naruto restored her mind at the cost of his dream.
He didn't give up though, even though he gave up the sure-fire way to restore his parent's minds when he brought them back, he was working to create his own ingredients in the future for that purpose. He never told her about his parents, and he never told her about the sex monsters serving more purposes. She grabbed a different notebook that contained details on all of the recorded sex monsters that Naruto had a personal interest in researching.
He made careful notes.
Each monster had something special about it that Naruto noted, Elmenhilde studied his notes in great detail as his notes weren't just focused on sex.
She carefully put his notebooks back where she got them.
"You're... more interesting than I thought." Elmenhilde spoke gently as she leaned forward and hugged her knees.
He didn't have to fix her.
He made the choice to fix her, and he made the choice to potentially give up his goals in order to undo the damage he had done to her. If she had been human, he could have fixed her much more easily. If she had been a living species, she could have been much easier to handle, but instead she had potentially robbed him of his dream. She grabbed Naruto's jacket off of the ground, before she reached into it.
She made the choice to have sex with him.
It was just as much her fault as it was his, but he was taking all of the responsibility onto himself for what had happened to her. What was more was that he was never going to tell her what he gave up for her. He would have been happy to pretend everything was alright, and keep suffering as he tried to regain what he lost.
"Please, I'm not Naruto... but give me the potion I need." Elmenhilde knew of a potion that Naruto had made already.
When she pulled her hand out of his jacket, there was a small potion bottle in her hand. She looked at the jacket with awe for a moment that it responded to her wish and gave her the potion, even though she was not it's owner. She uncorked it and lifted it to her lips, before her hands trembled.
She wasn't brave enough.
She lowered the potion from her lips and put the cork back on, before she put it up her sleeve and frowned. She hugged her knees tighter moments later and dug her nails into her shins.
It was harder.
She almost drank the potion that would take what she valued most in herself away from her, but she had been unable to do it.
She almost turned herself human.
While Naruto had been willing to risk never attaining his dream for her sake, she couldn't even turn herself into a human in order to repay him and show how much his actions meant to her. That was how hard it was to give up your pride and dreams, to give up everything you loved and knew. She had been too afraid the moment she almost did it, and couldn't do it. She could imagine it in her mind, him being just as afraid when he made the potion to grant her back her mind. Only, instead of putting the potion away like she just did, he made the potion and gave it to her in the hopes that one day he would be able to achieve his goals another way.
"He's a pervert, a super pervert... a degenerate greater than many others, but..." Elmenhilde stared down Naruto's sleeping face. Her eyes softened again when she saw how gentle his face was when he was asleep, nothing like the fact he showed that was perverted and happy when he was awake.
He was an eternal dreamer.
He didn't give up his dream, even if he had to sacrifice something that would make his dream easier. That took a heart that was stronger than anything she could imagine. She had just tried to emulate a fraction of what he had tried to do by turning herself human with a potion. Her heart had not been strong enough to throw away her vampire pride, but his heart had been strong enough to throw away his hope of seeing his parents with their minds intact. A dream that he had never even told her about himself.
She was going to do it.
Taking the potion back out of her sleeve, she uncorked it and quickly moved to drink it.
She stopped.
"Don't do it." Naruto was awake and had reached out to grab her arm. Her was sending her a stern look that was unlike his usual face. He was completely serious as he pulled her hand away from her mouth.
She smiled.
"I'm just paying you back for giving up everything for me."
"Just pay me back with sex if you really care that much... and don't tell anyone what you saw in those notebooks." Naruto looked at the ground where his notebooks were slightly moved out of place.
"You gave up-"
"Nothing, if I work hard enough, I will make a potion that will do the job just as well as the one I used for you. I never gave anything up, I just made more work for myself. That was all." Naruto simplified for her. She didn't agree, but she let go of the potion and allowed the bottle to shatter on the ground.
"There, I-"
"Why did you break the potion, if you didn't owe me anything before, you owe me now! That potion was hard as fuck to make!" Naruto looked at the potion on the ground and saw the liquid was already fading away. She could have just corked the potion up so he could store it away, but she went the dramatic route and broke the potion to prove a point.
"What!? Why do I owe you now!?"
"You broke a super rare potion I made, I won't be able to collect the ingredients for this potion again until next october! It's going to be tedious to remember that this potion is broken, and that I have to brew another... what if I forget and October passes, and I forget to collect the materials!" Naruto shouted as he pointed at the shattered glass.
He pretended he could just make any of his potions whenever he wanted, but a select few of his potions were limited time only for ingredient hunting. He could only gather the ingredients during super specific timeframes, and if he missed those timeframes than he would lose out on the ingredients.
"What ingredient do you need that is so rare?"
"It doesn't matter, it is physically impossible to gather it until an october full moon anyway. Well, since you owe me now, I'm going to need you to refill my supply of Bicorn juice." Naruto stated with a wide smile on his face.
Elmenhilde blinked as it registered in her mind.
So that was what he was doing.
'Sneaky guy... he's giving me a chance to pay him back, using the potion as an excuse since there is no way I would ever lower myself to not paying back a debt.' Elmenhilde stood up and scoffed. "Of course I'll help you, even though clearly I don't owe you anything." Elmenhilde pretended to fall for his acting.
...
"Bicorn Juice?"
"You're about to get pounded by a naughty horse."
Elmenhilde didn't like the sound of that.