Chapter 1: An Oaf of the Brilliant Kind
Hogwarts, Class 1961.
No one would think much of a boy bearing the name Arthur Weasley. Not with a fairly poor background despite having a mother from House Black, and neither because of his average grades.
By all means, Arthur was a nobody from Gryffindor that stuck out as a jovial oaf. But, of course, there is always someone keen to see the best in people and...
Molly Prewett was quite sure it was more than just a glimpse as many would expect.
Oh no, it was bigger than just that. Having been quite intrigued by how 'fake' Arthur was at times when interacting with his 'mates', she had decided to do a bit of an 'investigation'. Admittedly, she had been driven to see what the boy was all about after getting a look on those handsome eyes of his and his smile- still, the girl had been feeling compelled to see what Arthur was truly underneath that layer of faux social eagerness. And the answer to that came in the form of finding him fiddling with some muggle devices in one of the unused classrooms in the school after classes.
Hogwarts was not as 'big' as it used to be. If a century or so ago there were hundreds of students, now there was hardly a hundred if much less. And thus, many classes had been shut down accordingly, leaving most of the castle unused and open for those keen to claim any of those classrooms for their own reasons. Either those being nefarious plots or... whatever the redhead was up to.
Peeking from the half-open door, Molly studied the way Arthur was mindlessly playing with nuts and bolts and various tools she had seen some muggles use when fixing up some of their devices their her home. It wasn't exactly something she was most engrossed over, but since home was far from many others and she hardly had anything to do there, Molly had to adapt and just find such a simple mechanic work as 'interesting'.
To his credit, Arthur was making it fascinating with the way he wasn't just meddling with muggle things, but she could recognize some gems with runes engraved onto it. It all came to culminate with a strange circular sphere with several engravings, wires, and electric jolts passing through and over it. What was that?
Suddenly Arthur had paused, and Molly realized that she may have spoken that last thought aloud. And as his gaze turned to her, her posture stiff as she recoiled from a moment of contemplation between leaving or not, the boy just... eased at seeing her, and then smile.
"Oh, hello... Prewett?"
"It's Molly," She pouted. If there was something she loathed, it was people calling her by her last name. Why not just Molly? Isn't that a pretty enough name to utter?
"Molly, yes... if I may ask-"
"What are you doing?" She interrupted by asking the question first, seeing his eyes widening as he looked caught off-guard.
What? She could do that too if she wanted? It wasn't like the situation just favored her too much to make it easy.
"Oh- I... Well, I was doing some... science. Theoretical stuff."
"...What?"
"Well, how do I put this... are you familiar with ping pong?"
A frown adorned the girl's face. "Yes."
"Runes?"
"A bit-"
"What about heat-induced energy?"
She opened her mouth and... closed it.
Arthur nodded at this. "A quick lesson: if you slap a surface- say, a desk. You feel your palm heating up, yes?"
Molly offered a slow nod at this, and Arthur continued.
"Well, that heat is energy. Or well, could become energy if harnessed correctly. Do you have a car at home?"
Her lips twitched. "Why would that matter?"
"Just so that I can avoid going in depth over how a car's engine work."
"I do, and?"
"Well, the car needs fuel, but how does the engine create the means for the car to move?"
"It turns it in energy?" Molly sarcastically asked and yet Arthur nodded with a smile. "But... how?"
"It burns it, it creates heat which works internal pistons and then create the means for the vehicle to do all the chores needing energy," The redhead summarized quite curtly, then turning his attention to his spheric device. "This is sort of an engine like that, except it has a very simple concept no muggle can ever hope to achieve but we wizards can."
That intrigued the girl. "Which is?"
"Magic," The boy answered as he walked over several devices set by nearby desks. A lot of lightbulbs and little explanation just yet on what their purpose was. "This array is not something truly tied to the prototype, they are meant to be part of a 'pressure test' as the entire system here is meant to require the same demand of the average car on high performance. If my calculations are correct, then this may soon become the first self-sufficient car engine and overall energy maker in the whole planet."
Molly hardly understood what she just heard, but grasped that there was importance there and... it sounded simple enough to believe it. Sure, she didn't know 'how' that engine worked, but Arthur had that brazen confidence that made her heart skip a beat or two. Maybe her judgment was impaired by a potential crush on the dashing moron, but who knows? Maybe he is really up to something impressive.
Taking a seat together with Arthur, he soon made a gesture with his wand and the engine got turned on. Molly frowned and then gasped as she saw the sphere suddenly humming loudly as burning bright red light came from it, seemingly trying to escape its containment and yet just bouncing off the gems all over, electric zaps pulsating from the gems and then trailing to the wires connecting the bulbs. Soon, all the system lit up and... not all the bulbs got turned off.
Arthur's smile grew smaller as he took some notes, checking on some small buzzing devices and noting down the results.
"...What happened?" Molly barely managed to produce that question as her mind just couldn't grasp what kind of lightshow she just witnessed.
"Vermilious bolt casted by a central rune bounce about endlessly against all the gems. The gems have three runes, one for absorption of the heat of the bouncing, another to split half of the energy to reinforce the crystals, and a third rune which channels the leftover energy through the wires as electric energy."
"...What?"
"Heat energy from the bolt slamming around is split between keeping the gems resistant and also fuel the entire array."
That sounded about as complicated, but Molly nodded along with this. She understood that the bouncing made... heat and it then turned into electricity.
"But it wasn't enough," She pointed out and Arthur nodded at her words.
"It wasn't. But... this seems to be a matter of output, which meant instead of a single bolt, I may have to employ two at once."
That confused the girl some more. "Wouldn't it be better to use a Vermilious Duo at this point?"
"No, it would be too strong of an output and would probably break the crystals faster than they can self-repair. The crystals in this system can handle up to three bolts, so there is always a risk by using two bolts but... that should do it and maybe more. Maybe I could use some of the exceeding energy to further reinforce the crystals so... hm..."
He was back to scribble his notes, and Molly took this brief pause to think some more. Now, she wasn't a Ravenclaw, if that was the case she would have understood whatever Arthur was up to (in fact, she wondered how he ended up in Gryffindor despite showing intellect above the average), yet she got a hold over what this was all about: a car that didn't need to stop by to pay for fuel, a car that was also meant to produce energy that wasn't smelly or dangerous to breath. And... actually more than that.
She thought about the generator back home, of the electric bill they had to pay because of it, on how every essential tool required electricity and...
"Arthur, did you patent this idea?"
She may not be too familiar with the concept, but she had heard of how some people tended to steal ideas and then patent those themselves. And that- she could just be upset in imagining Arthur being treated to that.
"Not yes, but-"
"Do it. Now."
"But the prototype-" He tried to argue, but Molly wasn't having it.
"None of that prototype talking, I mean the idea. If someone was to eavesdrop on you like I did and they decided to steal it, they could do it easily. You need to guard your brilliance."
He opened his mouth but he paused and then blushed. It took Molly a moment too to realize why he appeared embarrassed, her own cheeks growing redder than her own hair.
"I-I mean, you are a nice person and- and I would be upset if you were tricked by someone that mean badly for you, that's all."
He was silent for a moment, then he just smiled widely.
"Thank you for your concerns, Molly. I guess I should do that at once!"
And it was in that moment, without any reasonable doubt, that Molly knew...
She was going to marry this oaf who was a smart man but clearly dumb in areas she was very seasoned about - indeed, this was a match made in heaven.
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AN
Molly: I am still eleven, so I can just have crushes-
*Arthur appears*
Molly: And then this dummy became the one I want to marry, FML.
(Still, this story will have a soft-core Tsundere - which is Molly - and an unexpected Kuudere - who is a year younger than Arthur and will appear in their second year at Hogwarts.)