"Neck and nipples are pretty sensitive on Rias, got it... I say the perfect size for her is about... 5... 6 inches to get the job done as well." Naruto, in the form of Rias, stated as he looked in the mirror at Rias' naked body that he had used to experiment with. Just one of the hairs he stole, and he was able to take her form with the use of a potion.
Thanks to that, he was able to experiment with her body to find ALL of the best pleasure zones. Masturbating as Rias to find all of that out was nice, and seeing as the clit alone had more pleasure recepters than the entire penis, it was a more pleasurable experience. Not to mention using her body, there was not "waiting period" between when he could cum. So instead of being forced to wait for a recharge after once, he was able to just keep experimenting with her body until he was satisfied that he had unlocked most of her secrets.
It was always an enlightening experience to masturbate with a female body.
He had managed to cum 7 times using Rias' body, so he had a pretty good idea of what it would take to make her cum quickly. The experience was pleasant, and he was surprised that Rias was a virgin considering what she was. That had been a slightly painful surprise for him at the beginning, but now he could say he knew what the experience of a girl losing her virginity felt like.
"Hey Naru...to?" Asia walked in as Naruto started to put his normal clothes on Rias' body, and with a snap of his fingers his body started to transform back to normal. She had seen him turn into a female before, but she was still going to be surprised at first when she saw a random person coming out of the bedroom and putting Naruto's clothes on. "Searcher is back from delivering the..."
"You can say the name of the Potion."
"The... F-futanari potion."
"Yep, there are some Lesbo Mages who want to have kids without adopting or getting some rando involved. Bet you liked testing that one." Naruto stated as he tossed Asia the antidote for the potion. She caught without hesitating, and drank part of it. "Quality, gotta give people what they pay for after all. If they want the antidote, that isn't included... batteries not included after all." Naruto stated with a chuckle.
The Futanari Potion did NOT wear off after any specific time period, it was a permanent feature, and he even added warnings to the potion bottles about it. In the Mage world, it paid to read the fine print of any potion that you bought off another Mage.
"Why did you make me test it?" Asia asked him in a low tone.
She slapped his arm when he just grinned at her.
"Seems funny, since you didn't know what the potion did. So, did you test it out... give it a test drive?" Naruto asked her with a grin. She slapped his arm again, her cheeks burning red. Naruto stretched himself out, and got the Post-Transformation kinks out of his body. "Rias has a sensitive body, that's for sure. She will NOT be hard to satisfy in bed, some dude will be a lucky man in the future." Naruto started to write down what he had learned about Rias' body.
He was going to design a monster, a tentacle beast or other such monster, that was perfectly suited to pleasuring her. He needed to make a monster that could be called the "Anti-Rias", because he wanted to watch as she was forced to writhe under the pleasure his monster could give her.
"... You're going to make a new monster, aren't you?"
"Nooooooo... not a new monster... an awesome new monster. I've still got some hair left that from her, and I've researched her body and learned it's secrets. Anyway, I've got to find a use for these useless rocks." Naruto stated as he gestured to the rock on his necklace.
Asia looked as Naruto pulled a jar out.
The jar was filled with about 19 of the red stones that Naruto wore around his neck, but the one that he wore around his neck seemed more special to him. Naruto looked at the jar of stones with annoyance, sighing as he looked at them.
"What are those?" Asia asked him.
"Pissing me off, I've tried my ritual to create the Ultimate Tentacle monster 20 times now, but I just keep producing these stones. I stopped shocking myself though." Naruto had created another 19 of the stones that he wore around his neck, and he was done with that stupid failure of an experiment that kept producing them. He would start from scratch and create an entirely new formula.
Naruto created a magical circle in his hand, and he loaded up some ingredients into a potion, and poured the potion into the magical circle that was in his hand.
Another stone appeared.
"If anything, my repeat failures have allowed me to shorten the ritual. I can create them on demand, and they have SOME uses... but overall I can't stand using these stupid stones." Naruto tossed another stone into the jar, and he threw the jar on the couch.
"They are pretty."
"Meh, take one if you want. I did find they are useful as potion ingredients, but they're useless for what they should have been. Still, I've already got all the information I needed on Rias, so it's time to test out these skills." Naruto grabbed his notebook and his pen, and he started to write out what he needed to do and counter.
Rias Gremory
Rias has a very sensitive neck, gentle touches alone can potentially bring her to orgasm. Something with light sucking ability. Studying her body, she has very high magical reserves and just as high control over them. Her female devil biology has the same abilities one would expect of a succubus.
She can suck out magical energy using her mouth.
Tentacles would work, but aren't right course of action for this monster due to her type of magical power being entirely focused on destruction.
The monster needs to be smaller than Rias is, and have a more dense magical energy, but will ALSO need to be able to overpower her ability to drain magic power.
"Can I help you?"
"Sure thing Asia, first thing I need you to do is get me the thing I have frozen in the freezer and hold it in your mouth until it thaws." Naruto started to draw magical ruins on the floor with his foot while he wrote down all of the ingredients he was going to use. "The best height would be where it can suck on her neck while still having perfect access to everything else... a size of between 5 and 6 inches for the penis... that would be best suited to hitting the right spots for Rias." Naruto muttered to himself.
Asia went to the kitchen and looked in the freezer, where she saw a couple of frozen slime monsters.
"Which one do I put in my mouth?"
"Blue one, and let it thaw, but do not swallow it. When it starts to move, spit it out in my hand." Naruto told her as he completed the ritual circle with his foot. Naruto's mind was going haywire as he started to work his magic. "Okay then, for a basic magical ability I should think about giving it hypnotic eyes... and use my Sensitivity potion as part of it's reproductive system." Naruto started to bring jar after jar from his book with one hand and scatter tham around.
"Is this potion making?" Asia asked while holding the thawing slime in her cheek.
"Potion Making mixed with Alchemy, I like making potions for monsters more, but I'm going to have to do this one from scratch. Around the ruins, I placed circles around. Now, gotta go with..." Naruto started to use both of his feet. Naruto laid on his back and held his notebook above his face as he wrote down in it. Naruto placed the different jars in different spots of the ruins. "Place the liquid oxygen right here, carbon here, hydrogen here, nitrogen here, calcium here, phosphorus here, potassium here, sulfer over there, sodium there and chlorine over there too, magnesium next to it, and there is that." Naruto hummed out to himself as he wrote down everything.
Asia got up when Naruto snapped his fingers, and she looked at him in surprise when she saw he was in complete Potion Making Mode.
"Assistant Asia on the job-"
"Mix these three potions until the one in the middle turns red." Naruto gave her a blue, purple, and yellow potion to start making. "Then add my blood into the mix until it turns black." Naruto gave her step by step instructions. "Hurry, no time to waste on any of that." Naruto tossed a stone into the center of the ritual circle.
Naruto started to write numbers into the air using fire, and the flaming numbers started to hover over the ritual circle.
"Like-"
"Not like that, shake it harder." Naruto didn't even look at her, and he knew she was doing it too slow. From what he was hearing of the liquid moving, she was not shaking it fast or hard enough. "Stop, and don't move." Naruto completely stopped moving, and so did Asia.
The elements that were placed in the ritual circle started to come together, moving out of their jars and multiplying. They started to form a body in the middle of the circle that was laying down, a humanoid body in shape and size, but on the smaller size when compared to either Naruto or Asia.
"So... why are you making this monster?"
"To prank Rias, now add her hair to the black mixture." Naruto tossed one of Rias' hairs into the black potion that Asia had created. It turned from black, back into the blue that it started out as. As the body on the floor continued to take shape according to the flaming measurements that appeared in the air, Naruto grabbed the potion from Asia and poured it inside of the forming body. "There, now it is High-Resistance to any attack created with Rias' magic. Her magical powers can't harm it through normal means." Naruto watched the ritual circle change colors, and Naruto continued to write flaming numbers in the air.
The circle returned back to it's normal glowing color, and the body continued to form.
"He seems small."
"The female body has a shorter torso than a man, but longer legs in comparison. To make him best suited to pleasuring her, he needs access to her neck and her crotch. So he will be short and petite. Gotta make him cute too, otherwise his body proportions will look weird." Naruto saw the wings start to form on his back. The color of his skin started to become known, and he had a very light peach skin color. "Then gotta add this." Naruto poured a golden potion into the still developing body, adding his own DNA into the mix.
"Why are you doing this?" Asia asked as she spat the thawed out slime into Naruto's waiting hand.
Naruto placed the slime into the developing balls of the monster, and the slime started to fuse into them. Asia was viewing the creation of a monster from scratch, and Naruto handed her a tape measure.
"I'm doing this because it seems awesome. Rias is very strong, and seeing somebody strong like that, makes me want to mess with them even more. Making a monster perfectly designed to cover all of her weaknesses? A monster that is 100% designed to bring her the ultimate pleasure... it's good practice. One day, I will complete the ultimate tentacle monster that can do everything these practice monsters can do and more." Naruto stated as he saw blue eyes and red tinted blond hair forming on the monster's head.
A long tail came from his tailbone, and his eyes stared blankly into the ceiling, but there was still a large hole in his chest where his body had yet to finish developing.
"What am I suppose to measure?"
"Dick size, I'm used to making potions that will give monsters larger dicks, but according to what I've learned about Rias' body, this one needs to be more tailor made to hitting the best spots for her. Rias is very sensitive, and too big could bring her too much pleasure too fast. The best pleasure is brought over a longer course of time. This size would be best suited for giving Rias steady and controlled pleasure, while also bringing her the perfect amount of pleasure for it's size." Naruto started as he looked at the dick finish developing completely.
"... 1..."
"It's not hard, just lightly touch it, and it should harden." Naruto explained to her with a roll of his eyes. There was a pause, and after a moment Asia cleared her throat.
"5 long, 1.3 wide, and a-"
"Okay, then I was right. Rias's vagina has amount a surface volume of 6.19 inches squared, and this dick will be 6.64 inches squared. This will stretch Rias out the perfect amount to feel great, without it being uncomfortable. It will slide in just right." Naruto was in FULL potion making mode. Right now his brain was working in overdrive, so he could do calculations in his head that he could never dream of doing when he wasn't working on a potion or making a monster.
"Eh?" Asia questioned.
The hole in the chest was nearly closed up, and Naruto reached into the chest and held the stone up where the heart should be. As the hole closed up, the stone started to transform itself into a pure red, stone heart when Naruto changed the form of the stone slowly. Within moments, Naruto made the heart float and the stone became one with the monster.
*Thumb-Thumb*
"I can feel a pulse." Asia said as she placed hand on his wrist.
The monster was alive.
"You did it!"
"Not yet, I still need to modify his body. Lets see, I'm going to have to remove his bodies sexual limiters, so he doesn't ever have to go soft... then I need to program his brain after that. Right now, he's alive... but he has no instincts and no mental abilities due to him being a completely artificial life." Naruto explained to Asia, and she noticed that he was still looking blankly at the ceiling despite being alive.
"You didn't do that during the ritual?"
"No, because if I did that, he might have tried to fuck you when he first woke up. I'm going to work on magically programing his brain LAST after I put limiters on him, and remove some of his pre-made limiters. I might have created him, but he isn't anywhere close to ready... it's going to be a LONG night!" Naruto had a wild grin on his face. "Look at my cute little Trap Incubus, look at him... isn't he just a beautiful one. He's going to drive Rias absolutely crazy... Oh, better make him unable to breed." Naruto reached down and cupped his junk.
His hand glowed and he imprinted a magical circle on the underside of his junk, the same circle he used for most of his monsters that he did not want to be able to breed without his command.
Naruto put the palm of his hand on his monster's forehead.
"What are you going to name him?" Asia asked, since Naruto always gave his monsters names.
...
"Sair, I'm thinking Sair." Naruto spoke with a gentle smile.
Sair?
"Why Sair?"
"... Just say the name again, and the answer should come to you." Naruto deadpanned to her. "It is the Anti-Rias monster." Naruto explained further.
Sair... Sair?
Oh, Sair.