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Genos was practically vibrating with excitement right now.
Last night, while they had been out camping, the pair had decided to catch fireflies before heading to bed. The activity, surprisingly, had been Saitama's idea, and the man refused to tell Genos what his reasoning was no matter how much he begged to know. All he had said was "I wanna do something cool with them". But Genos didn't protest. Not because he was too tired or because he had his personal reasons to do so, but because it was the first activity Saitama seemed… excited to do. Hell, he suggested it, and Genos would be damned if he didn't participate in something his boyfriend wanted to do. Plus, he actually liked catching fireflies too, so he really didn't have any reason to even consider saying no.
They spent hours doing so, went to bed once it'd hit midnight, and on their way home while the sun had started peeking out to signal the arrival of dawn, they caught a couple more. Just the stray ones fluttering near the ground or sitting on tree trunks and weed leaves.
Upon reaching their apartment door (which they now shared because Genos had outright protested the idea of sleeping in separate ones; even going as far as to sleep in the hall until the bald man gave in. It only lasted 20 minutes before the A-Class opened the door for him), Saitama had lifted the mason jar to his face and stared into it with such awe– Genos swore to the omnipotent being above that the bald man had no right to look so adorable—no reason to look so goddamn cute with his face pressed to the glass jar, watching with glittering eyes as the glowing bugs jumped and flew around in there. He looked… younger. Happier. Peaceful and like he didn't have any mental hurdles to hop every day. It didn't at all make him tear up, no sirree.
They entered the apartment, and once inside, the two made a beeline for the kotatsu and set the jars down on it. Genos immediately began putting the camping gear and tools away and setting up the futons and blankets, while Saitama spent the last few minutes watching the insects crawl around and glow. The tranquil look on his pretty face with his head in his arms whilst he watched them made the S-Class' brain buffer and core stutter.
He (reluctantly) told him the futons were set, and they got ready for bed—brushing their teeth shoulder-to-shoulder, putting on their pajamas (or, Saitama putting on underwear and the top while Genos stole the pajama bottoms), and sharing a few brief kisses—then went to sleep, cuddling close and in each other's arms. They wound up sleeping until noon. Or, Saitama did. Genos woke up way earlier, but stayed in bed with his partner until he woke up. And even then, he'd only gotten up to make (breakfast? Lunch? Brunch???)
They spent their day lounging around and sparing a few moments to admire and feed the little guys in their jars, their lights long gone now. Genos asked, once it'd started to darken outside again, how long he planned to keep them. And when Saitama had told him "Tonight," Genos caught on to what he was planning to do. So now he stands atop the Hero Association HQ building, the sky just as dark, if not darker, as it had been last night. The stars were still plentiful, but right now, the cyborg could only focus on the jar in his hands glowing and fading a bright neon yellow-green in a steady rhythm. Saitama held the other jar, and Genos was waiting for him to give the signal.
The bald man looked back at him with a wide, almost exuberant and eager grin. He had the urge to kiss it.
"Ready?" He asked, lifting the jar slightly for clarity.
With a sharp nod and determined scrunch of his face, Genos replied with "Yes, sensei!"
The two turned to the sky in unison, twisted off the lids gently, and set the bugs free.
Almost instantly did the bugs filter out in a wave, with only a handful straggling. It was almost like a flower, the way they flew away, rising up from the jars like stems and spreading out in different directions like flower petals. It looked like the stars were being replaced with big fairy lights, the green little guys flying away and unknowingly taking the cyborg's breath with them. They looked… he doesn't know what words could possibly describe what he was seeing. It was like the black canvas that was the night sky was painted over and the tiny specks of stars were replaced with larger ones. It almost looked like they were swarming the headquarters, had they not obviously been spreading out and away over the tides of sky. Not to mention the cities below with vibrant lights that complimented the bugs well. Nearly the same color, too.
His feet carried him forward as he made his way over to his boyfriend, and sat on the ledge to join him in witnessing the surreal view. Slowly but confidently, he raised his arm to wrap around Saitama's shoulders and pull him into his chest. The hero took the invitation for cuddling happily, and Genos mentally gave himself a high five.
A content sigh left his lips as his head slouched to rest atop of Saitama's.
The older hero shifted under him to look up at him. Genos moved to give him his full attention, assuming he wanted to say something.
"You really make my heart firefly," he said, grinning impossibly wide. The cyborg sighed in exasperation.
"That one was dreadful."
Saitama giggled, then moved to tuck himself back into his comfy spot under Genos' head. "I know."
A comfortable silence fell over them, then. The glowing bugs have now spread out evenly, making the sight just that little more stunning, but they still managed to swarm the cyborg's mind so the only thing he felt was tranquility, delight, and adoration.
He squeezes Saitama's shoulder, pulling him closer.
"You make my heart firefly, too, Saitama."