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Sometimes when Genos comes home extra late, held back filing out nonsensical reports or dealing with the after damages of a battle, or simply not having the literal energy to run and having to take the last train home, things tend to slip his mind.
He sauntered into their apartment, all the weight of his body passed back and forth between his legs as he made his way down the hall, past the kitchen and into the quiet room. The table had been put away and the foldable bed was out, matress looking ever so full and pouncy.
Nothing had ever looked so tempting.
Too exhausted to remember there was someone else here, half-lidded eyes overlooking the sleeping, curled form underneath the blankets gently breathing, Genos sighed and plopped down face-first into the bed - only to have his massive weight send a wave over the mattress and thwack the strongest man in the world two feet into the air. Saitama crashed and crumpled down into the corner between the wall and the bed, scrambling up and wildly looking around before two brown eyes glared into Genos’. “Hey!"
“Oh - I - I deeply apologize, Sensei!” Genos spluttered, frantic and sheepish altogether as he scrambled over to help him up. “I-”
He fell backwards as a pillow charged with all the rage of a bald man awoken at two in the morning could summon came at him.
Neither of them like to share either: though Genos would certainly love to hand over the entire blanket to his precious sensei on cold nights (especially considering he didn't really need one), he only did it when he was awake . When he was sleeping...well. Old habits die hard: every night in the most coldest, unforgiving temperatures, Genos’ fingers would reach other and snatch the blanket from his sensei, abandoning the poor man out into the cold.
In his defense, he was asleep - they both were, actually. But it was also in this sleep that Saitama would grunt, eyebrows furrowing, hand blindly swatting around before he caught a fistful of blanket and pulled back, rolling over and bundling himself like a cocoon to steal all the warmth for himself.
Sleeping Genos doesn't like this. His eyebrows furrowed and, reaching out, his metal hands poking and prodding and roughly jabbing at Saitama’s cheek before finding the cloth and yanking it back, smiling contently in his slumber as he cuddled into the fabric, inhaling his sensei’s scent.
Sleeping Saitama gritted his teeth, mumbling out nonsensical complaints. He fidgeted as a rush of cold air swarmed him, leg roughly kicking Genos’. In one move he slapped his arm across the bed, hand tightly bunched over the blanket, and snatched it back so hard it tore right in half, fabric splitting right down the middle.
In this manner, the problem was solved.
(At least until morning when Saitama gaped in shock at the state of his blanket.
“What...what happened ?”
Genos wordlessly pulled out a sewing kit.)
“All right, that’s it!” Saitama declared a newly made border, building a wall of pillows down the middle of the bed. “No more moving around, Genos! I’m tired of this, so from now on, you stay on that side and I stay on this, got it?”
“Yes, Sensei!”
The wall was immediately infiltrated; in his sleep Saitama had thrown his leg out, his foot breaching over one of the pillows and onto Genos’ side. Genos noticed this and, like the good peacemaker he was wanting to keep the Treaty of Separation intact, he ever so graciously tucked his foot back onto his side and repaired the pillow wall. Once he was finished, the cyborg turned over onto his back and closed his eyes, preparing to shut down for the night.
That is, until Sensei invaded again and rolled over, now both his arm and leg thrown not only over the pillow wall but now over Genos . The young cyborg gaped, little puffs of steam simmering out his shoulders. With careful hands, he delicately tried to get Saitama back to his resting spot, worried he’d awaken him but… but now the bald man made a sleepy hum and came in closer, scooting right over the pillow wall and onto Genos’ side entirely, arm encircling his torso and stray leg curling over his.
Genos’ core lurched, entire body tingling with electricity. How will he get Saitama back to his proper side now without waking him up? This was a serious impeachment of their treaty! Sensei will wake up and get upset!
Now resolved, Genos squirmed from his grip, only to be overwhelmed when the enemy attacked by finally grabbing him and pulling him to his chest, his diabolical head lolling over in sleep, mouth a little ways open and drool sliding out adorably as he outright cuddled with the defeated, overheating cyborg.
Genos sighed. For once, he didn’t quite mind admitting defeat.
“Man, this thing really does take up a lot of room, huh. Do you think it’ll just be easier if we use futons?”
Genos thought about it. “Perhaps. It would certainly shorten the list of inconveniences sensei has listed.”
And so the following morning they tugged out the foldable bed and mattress, leaving them out by the garbage cans to be picked up while they went shopping for a pair of cheap futons.
The night was cold, but their blanket wasn’t helping this time; Saitama laid on his back and frowned at the ceiling. He tossed, turned, shuffled a few times, but found nothing was working. He rolled over. “Yo. Genos, are you awake?”
A moment of silence passed where he squinted into the dark form next to him before ever so quietly: “Yes, Sensei.”
“Can’t sleep either, huh.”
“No, Sensei.”
Saitama hummed, rolling back. They laid for a while then, the two men staring up at the soft pale blues of the ceiling, the wind howling just outside.
“This sucks," he finally said.
“I agree.”
“You know, I bet that old bed is still clean - I mean, it’s only been out for about a few hours…"
“I wrapped it in plastic to protect it from outside nuisances."
“Huh. Do you think it’ll still be warm if we bring it back in? Hypothetically speaking.”
“I don’t think so.” A pause. “But I have heating systems.”
“Ah.”
“They work best at close proximity."
“Cool.” Another pause. “You wouldn’t mind if the treaty was broken then, would you?"
"I would not, Saitama-sensei."
By then they were already hauling the bed back inside.