Da Vinci's Workshop

After you were done showering, you and Bradamante had gone around the base, checking out the facilities open to Master and Servant alike. As expected of her hardworking nature, the facility that caught her eyes the most was the simulation room.

Simulation Room was used to upload Servant's and Master's consciousness into a virtual reality space. Said virtual space could be modified to simulate any type of field, and even generate some dummy enemies to fight. Basically, it was a safe space to train for Servants whose fighting power could very well demolish the whole Chaldea base to kingdom come.

Bradamante had stayed there with your and the staff's permission while you proceeded to your destination. The rulebook was safely kept inside your jacket.

Arriving at your destination, you pressed the intercom affixed to the wall. You didn't need to wait long until a cheery voice rang out from it.

"Yes, yes. The genius Da Vinci-chan here! Oh, it's you John-kun. Do you need something from me?"

"Yes I have something to consult with you. May I come in?"

"Of course, of course. Come on in." The automatic door slid open, revealing the room behind it.

You stepped into the workshop, gawking around the peculiar décor. Different from the futuristic image exuded from the whole base, Da Vinci's workshop was set up to mirror the period where she came from. The wooden flooring, the polished stone wall, the whole interior was giving you a vintage feeling. Several unknown gizmo, probably inventions or models she had been fiddling with dotted the entire place in haphazard fashion, though you harbored the suspicion that she would know exactly where all things were in this room.

"Well, well, it is quite surprising to have you be the first Master I welcomed to my workshop. So how is it? Like what I did to the place?" The Heroic Spirit of Chaldea, the genius Leonardo da Vinci was waiting for you with an easy smile at her work table. "Coffee?"

Some contraption with steam coming out of it was dispensing hot coffee into cups on her table. She pushed one of the cups across the table, placing it right at the side where an empty chair sat.

"Thank you." You sat on the chair without reaching for the cup of coffee. "And yeah, it feels like coming home to a secret renaissance hideout I never had."

"I'll take that as a compliment." She winked, her chin resting on her hand. "The way you carry yourself sometimes make me forget, but you really are a magus, eh? John-kun. Always suspicious of free drinks. Even though you have established a contract with Bradamante and gain invulnerability, you still keep your guards up."

You sighed internally. You hadn't told anyone about your contract with Bradamante. The fact that she found out meant that Da Vinci had bugged your room after all. Ignoring that little trivia, you idly stirred your coffee.

"Some of my acquaintances has told me I am paranoid. Can't seem to shake that bad trait off." You stared straight at Da Vinci. Her eyes weren't mocking you, if anything, you could sense a bit of respect.

"Any episode you are willing to share?"

"Got poisoned by my little brother. Anyone will learn after something like that." You shrugged. "Invulnerability might sound awesome, but there are a lot of things in this world that could bypass something like that."

If Da Vinci wanted to incapacitate you, she only needed to spike your drink with something to knock you out. After that, she could just detain you in a secret dungeon somewhere if she wanted to take you out of the picture.

You weren't so arrogant that you would neglect basic caution.

"Anyway, that is a part of reason I came here." You began. "I need your genius to find leaky holes I need to cover in my defense."

"Okey dokey. You can leave it to Da Vinci-chan." She answered lightly. "I'll give you a list of scenarios that will... take you out of the equation without harming you. Just give me a day or two to make that list."

"Thank you, Da Vinci-chan." You nodded gratefully to her. "Oh by the way, can I ask you for another favor?"

"Hmm? What is it?"

"I want you to masturbate to the recording of me and Bradamante every night." You told her clearly. "Imagine yourself in her position, being fucked by me and do your best to replicate the pleasure, but don't cum. The only way for you to cum from now on is by my conscious permission. Can you do that for me?"

"Y-you-" She stood up from her seat and looked at you in shock. "That's a mean order, John-kun! I will be horny all day then! That will interfere with my work!"

You covered your ears at her outburst. "So you won't do it?"

"Of course I will! I don't have a chance in the matter, do I!?" She sighed and let her forehead rested on the table. "Everything you order to me inside my workshop is absolute after all."

Inside the pages of the rulebook, a rule was imposed onto reality and with it, not even the Uomo Universale could resist it.

[New Rule: Every order or favor asked of Leonardo da Vinci when both John Doe, the current owner of the rulebook, real name: #####, and she are in her workshop is absolute. Utterance of order from John Doe along with carrying out said order will not result in Leonardo da Vinci disliking John Doe.]

"Deal with it then. By the way, will there be any negative outcome if I drink this coffee?" You tapped the cup of coffee in front of you.

"You might find it harder to sleep thanks to the caffeine. It has slight laxative effect too if you aren't used to it." She groaned.

It was just a normal coffee then. You sipped at it. "This coffee is pretty good."

"What do you expect? A genius made it after all." She huffed. "So, is that all?"

"No actually. I want you to develop lotion and lubricant for sexual purpose that will make any servant aroused in seconds. Aphrodisiac lotions for servants basically. I want to use it to enhance Bradamante."

"Consider it done." She replied. "You have quite the twisted mind, John-kun."

"I will take it as a compliment." You raised your cup before thinking for a bit. "I will take my leave after I finish this cup, so until then, please get naked and twerk on the table, Da Vinci."

"This **** driver." Da Vinci sighed, but immediately pulled up her dress, exposing her dark blue lingerie.

You spent the late night at Da Vinci's workshop, enjoying a nice coffee and the front row show to her foolish naked dance on top of her work table.