(Cheese? Yes. Hotel? Trivago. Did I get carried away again? Yes. But did I have fun while writing this? Yes. Enjoy.)
The Keep It Simple, Stupid. Or also known as the K.I.S.S rule. A rule they had made for each other as they sometimes got a little too complicated when talking to each other. A rule that now took shape in the form of a question.
"Would you marry me?"
"Yes, yes, yes."
Ciel didn't even wait a moment before changing her outfit into a wedding dress. And then she poked Rimuru and changed his outfit into a pure white suit that matched with her.
The world all around them changed for a moment as a gazebo was formed around them.
Noticing all of the sudden changes Rimuru couldn't help but let out a small chuckle.
"I guess there truly is no time like the present. Did you plan this?"
Ciel was still smiling with absolute joy as she responded.
"Yes and no. I have been thinking about this for a while and I had something else in mind. But I decided to throw that all out the window about one minute ago…. Which did give me enough time to come up with something entirely new…"
"Well, thinking about it now. Even though we have been together since the very beginning, we have rarely spent time together properly. You know, doing something other than research or working." He said as he gazed into her crimson eyes.
"He He, I knew you'd say that." Ciel said as she grabbed his hand and led him to step outside of the gazebo.
"So just you and I, together, now that we finally have the opportunity without having to worry about anything. We can make time slow down to a crawl everywhere else, so no matter how long we spend here, it will only feel like a second on the outside." Ciel said as she began transmitting parts of the new plan she had just made.
And then she gave a mischievous smile.
"We can even take some time to make a ring bear…..er."
Answering with the same mischievous smile he said.
"What a suspicious pause."
"I have no idea what you are talking about." Ciel answered while holding back laughter.
She stopped for a moment before snapping her fingers and changing both their clothes again into something more comfortable.
"Aren't we about to be a bit irresponsible right now?" Rimuru asked as he began to run through the plan Ciel had put together.
"Well, except for us it is just going to seem like an in and out 20-minute escapade. As for any mess we make in this world… It was already messed up when we first got here, so no matter what we do it couldn't be worse than how it was. Worst case scenario we can just fix everything back up before we leave." Ciel said as she began to create a couple of things out of thin air.
…
(Some time later…)
Looking at the mess they had made below them both Ciel and Rimuru were a bit speechless…
"Hey, Ciel… Do you think this is a sign we should maybe adjust some of the experiments we had in mind…." Rimuru said as he dodged a fireball that came from below as roars of battle were heard.
"This sign can't stop us because we can't read." Ciel said with a poker face as she looked at the mess they had made.
"Note to self, make sure to have someone else making sure we don't get too carried away… Now that we can't run out of magicules we don't have a 'That's enough' warning."
"..."
"..."
"..."
"..."
"Alright, moving on." Ciel said as she snapped her fingers clearing away the mess that they had made.
"That was fun though." Rimuru couldn't help but mutter under his breath.
Ciel only nodded silently in agreement.
…
(More time later)
Both Ciel and Rimuru were on the floor laughing at themselves.
"Ciel, we are an absolute menace to society, aren't we?"
"Luckily, I don't see any society around us." Answered Ciel while looking at the clouds.
What once used to be a simple world had been replaced with a weird amalgamation of hundreds of different ideas. There was a paradise built next to a desert, a strange cave next to an ocean, a floating mountain with a WcDonald's on it.
Some time had passed and they were simply relaxing on the comfortable grass. Then suddenly, Rimuru sat up.
"We got distracted!"
"Ah, that's right!" Ciel also said as she sat up. It was impossible for her to forget anything, but since she was having so much fun she continuously decided to just delay it a bit longer.
She rebuilt the gazebo and changed both of them to their wedding attire.
"K.I.S.S?" he asked only to receive a nod.
"We are already mentally connected. So we can already tell what we feel better than with the use of any words."
"In that case. I, Rimuru Tempest, take you, Ciel, to be my beloved wife. To be a menace to society and to get carried away while creating things. To accidentally destroy a perfectly good planet and rebuild it once again. To build and create, and to continue learning. And to spend the rest of our lives continually making eternity feel as if only seconds have passed. To-"
He was about to continue speaking when his lips were sealed.
"K.i.s.s. I do." Ciel said as her mischievous smile appeared once again.
"RoAaaaar"
And turning to their left they saw a tiny black bear with a golden and yellow streak of hair. And with two rings on a pillow on his head. For some reason, he appeared to have the biggest and most prideful smile ever.
"Ring Bear….er" Ciel said as she chuckled.
"Is that…" Rimuru asked while looking at the bear in confusion.
"Diablo. Yes, we made him too strong. So he appeared here not too long ago. Even when less than a millisecond should have passed everywhere else."
"Roar." Diablo said while still transformed into a black bear. There were even tears in his eyes from joy.
"He says he is happy he is able to be a part of such an important event." Ciel translated for him.
"Roar."
[I originally wanted this to just be you and me, but I kinda felt bad for him.] Ciel said through a mental message.
"Roar."
"Alright alright, I know you want to continue to be a part of this, but…" Ciel said before telling something to Diablo through thought communication.
And after showing an extremely happy expression he disappeared after saying.
"I shall make preparations for it!"
"He is a bit weird, but he has his priorities straight," Ciel mentioned after hearing him use actual words instead of a roar.
The wedding celebration finished shortly after Diablo left to who knows where.
Which only led to the final event.
The request that led to everything that happened in this world.
Having a child.
…
(Even more time later)
Opening his eyes he found the disheveled bed. Which led him to remember what happened before he fell asleep. And he looked to his side to see a smiling Ciel.
She put a finger on her mouth to indicate to be quiet before pulling out what appeared to be a small orb full of life and magicules.
It was similar to an egg, but in reality, it bore a closer resemblance to a skill core. Similar to the orb from which Ciel had emerged when she became a Manas. And, at the moment it was only the size of a ping pong ball.
Ciel brought the core close to her heart, or where it would be, before the orb disappeared.
"She's sleeping right now. It will take a long time for her to grow and be born. But she is real now. She's our daughter." Ciel said with absolute joy.