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Your relationship with Sai has been healthy and peaceful even after 3,700 years apart. But that also meant a tad bit boring, especially for you. Knowing him, he will never suggest changing a routine or an idea because he's the type of guy who's content with the way things are.
That also meant he has no clue how to spice things up between the two of you, so it's all up to you. Luckily, you remember something very interesting that you're so sure it will suit him best. And maybe, he'll like having some change.
Inside the central base in Japan lies the immense and primitive computer of the Stone World, and a place where Sai naturally gravitates to it. The room was filled with low hums of distant machinery and the familiar rapid clicks.
Sai's fingers worked meticulously and swiftly on the computer just like how he used to do in the modern world as he hummed a simple tune, usually forgetting there's a whole world other than programming entertainment. It's surprising how he still manages to make use of it with ease.
He doesn't notice you walking up behind him until you place your hands on his rigid shoulders, making him jump under your touch.
“Sai! In your own world again?” You called out as you shook him gently.
He doesn't turn his head your way but his fingers stop working. “Yeah, these games don't get programmed by themselves you know.”
You huffed and shook him with more force. “Come on, you need some social time with me. Move it!”
He chuckles at your attempt to remove him from his sanctuary, good thing he loves you just as much as he does for video games otherwise he wouldn't even move an inch, and maybe the fact he also enjoys your company better than most people.
With a stretch of his limbs and fingers, he gets up and finally faces you, as he takes your hand, his lips grazing against your warm skin. “Alright, take me to whatever chaos you're planning.”
Then, a strange noise intervened. Click.
His breath hitched a little from the abruption, he couldn't tell where it came from.
“Is something wrong with my genius?” You teased with a suspiciously calm look.
His eyes scanned the perimeter, your figure, and your face. There wasn't anything unusual. You're standing quite innocently, one hand behind your back and the other still on his, he's unsure if he was hearing things. A blush paints his cheeks when he realizes he's gazing at you longer than he should rather than answering your question properly. “Nothing.” He mumbled under his breath.
Your lips merely upturned from his unconvincing answer but gave no effort to push out his thoughts, and you pulled him away to step outside — the hums of the machinery were getting on your nerves honestly.
He blinked once the afternoon light loomed over his face, trying to get used to the sudden glow.
Giggles left you when you saw him adjusting to the outdoors. “You're ridiculous, three millennia have passed and you're still getting yourself sucked into devices for hours.”
“I had to make up for lost time.” He quickly defended himself.
“Then do the same for ours!” You bit back and took his hand as you marched away completely from the area with him stumbling slightly and trudging behind. “I need to teach you a lesson mister.”
He perks up an eyebrow, he couldn't tell whether you were joking or serious because your tone indicated neither. “Uh, sure?” He hesitated but went along with you anyway. Surely it's nothing too bad.
Surely.
…
It doesn't take long for you two to arrive at your place since you live nearby; it takes about 10 minutes to get there. A simple wooden hut with a few flowers surrounding it for decoration, nothing too much, but enough to feel like you're at home.
Of course Sai — the gentleman he is — walks up to the door first to open it for you. His hand grabbed and barely pulled the handle when he already heard the same noise. Click.
He whips his head in your direction, but you peck his cheek briefly before stepping inside, making the poor boy flush at the sudden affection of your lips, even though it lasted almost a second.
He shrugged it off and decided it's best to forget about it; maybe going back to that unhealthy screen time routine is getting to him. Although he can't shake off the feeling that something is up.
You already settled yourself at the futon and called out to him the second he's inside. “Sai, come here.” You patted the spot to your right, gesturing to him to sit beside you.
The moment he steps over and slumps down on the futon, it goes off again. Click.
And immediately, you move your fingers through his scalp, brushing through his soft and curly strands — it makes you envy how smooth it feels despite having limited hair products. Are his genes seriously that good?
His ears blushed in a deeper shade of red than before, and melted under your touch. It's hard to deny how much he loves your hands working on his head. Thanks to that, he completely stops thinking about the click and focuses on the sensation of your fingers playing with his hair.
But that feeling of contentment vanished when you removed yourself from him, his frown almost made you think of a puppy, an adorably sad one. It was amusing to see your boyfriend acting like one.
“Sai, can you grab me a glass of water?” Your request was simple. Maybe too simple because you wouldn't ask him something like this. That doesn't stop him from getting up and eagerly following your words though.
He returns sooner than expected, holding a glass cup, and carefully hands it to you. Click. His ears perk up at that noise.
“Thank you, my genius.” Your voice held that alluring tone. Has he ever mentioned how much he loves that nickname, especially when you call him like you're trying to seduce him? It does wonders for his brain, causing it to buffer slightly.
He's starting to ponder why he's feeling like this. Well, he's always been a mess whenever you flirt with him, but never this badly.
As you take a sip from the cup, something unfamiliar peeks out from your other hand. A clicker — the only thing you begged Senku to make, you can never forget the look of disgust on his face when you asked for it. So that's the source of the sound.
He shrieks at the discovery and he couldn't help but feel disbelief that you've been clicker training him since earlier.
You empty the glass and shift your attention to him, you weren't hiding it anymore. You held it up to him like a prize with a smirk. “Feeling surprised?”
“Yes! You've been doing that to me?!” He yelled and pointed at you as if you committed a crime.
“Oh please, I know that you enjoyed it.”
“No! I! Did! Not!” He fluttered his hand up and down frantically in each word.
“Mhm, you're in the stage of denial.”
And that's the unfortunate part, he did like it. A lot. But he'll never admit to it, he would rather be stuck with Ryusui than mutter that statement out to you.