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Many things have changed for Serizawa ever since confessing to Reigen.
They range from small little details all the way to significant changes in his routine. The other bleeds shamelessly into his life, filling holes that the ESPer hadn’t noticed were empty until Reigen made himself comfortable in them.
It's the second toothbrush in the cup on Serizawa's sink that never really gets thrown out because its owner would return soon enough. It's the additional movies and shows he'd have never bought for himself, slotted in between his own favorites, everything sorted alphabetically nowadays - except for the ones he had recently pulled out and that were still laying on top of the small shelf. It's the way he folds laundry into small and neat packages now, Reigen having taught him how to save a significant amount of space to not have to throw away any of his belongings.
The other man has wrapped himself tightly around Serizawa’s life and heart, never demanding too much from him but giving back everything he could. Gentle touches, loving words of advice, the openness to simply listen to the ESPer and large honest smiles only meant for Serizawa’s eyes - Reigen is offering it all to him without expecting anything in return.
Saying that he's in love with him is far from encompassing the whole truth. The emotions that bloom in his chest and spread through Serizawa’s body every time he so much as looks at Reigen would have been downright terrifying years ago. They travel through him, washing over him in a way he couldn’t quite put into words. It is an incredibly comforting and never ending warm presence that fills him with the knowledge that he belongs. That, even if he hadn't known, he always had had the right to find his place in life and was worthy of more than he had believed.
That knowledge had taken hold of him the first time he had fallen into Reigen’s arms and hadn’t left since.
He's fully devoted to the other, but he's also aware that the other is equally enamored with him. It had been hard to wrap his mind around it all - that someone like Reigen would truly want him in the same way and that after everything he could allow himself to be loved. It's been several years at this point, but initially Serizawa had struggled with accepting the other's affection and love without feeling the need to pay him back for every action of kindness. None of the words or touches had ever come with expectations - every kiss and hug and part of himself he had given to Serizawa willingly. Not once had the other's affection towards him come with any sort of condition.
The ESPer is allowed to have the other. He is allowed to indulge in him as much as he wants to. All their tiptoeing around one another, the hesitant touches and the yearning glances had not been for nothing. It had pushed them both to step beyond an unknown and daunting line to be much closer to each other than they could have ever imagined. Both of their carefully constructed faces had slowly melted away over time - had been taken apart to show the other more of who they really were. Still, it had taken them time at first to get used to one another. With the unspoken words between them addressed, they still needed to figure out what their new relations truly meant and the both of them had certainly not been perfect at this immediately. However, they had been willing to learn.
At this point the trust between them is rooted deeply, Serizawa no longer hiding away and allowing the other to see his full range of emotions without having to worry about fearful looks or distance. He doesn't have to shy away from wanting Reigen, knowing that every touch and desire is something the other craves just as much and just as intensely as he does. No matter how hard it had been to accept at first, Seriawa can see what is right in front of him now. There's no mistaking the sly and teasing touches at work anymore - no mistaking the moments filled with casual intimacy of holding hands or going out for dinner together and much less is the way Reigen's body reacts to his touches, shaking and twisting within his hold, meeting every movement of Serizawa with his own. All until they lay next to each other, exhausted and filled with nothing but pleasant euphoria - their heated and firm touches having turned into gentle and caring ones.
Some days it's still too much and too overwhelming to know that Reigen is ready to be at his side forever, but the more days they spend in each other's lives the more the knowledge festers deep inside his heart until one day it will fill him completely.
Everything that is Serizawa Katsuya is accepted with open arms. Every little mannerism and gesture Reigen takes in almost greedily, even going as far as to reach out carefully towards the parts that Serizawa hates about himself. He allows him to express his worries and is ready to put aside anything to pay full attention to the ESPer instead. Reigen is ready to twist and turn everything to allow Serizawa to shape himself into a better person. He is almost certain that the other doesn't even know what he's doing - that he's unaware of what his kindness does to everyone around him and how he's affecting those closest to him.
Each and every day he falls more and more in love with Reigen, never once regretting the time spent listening to the other's energetic stories or ideas - never once pulling away from giving him comfort on the days that he needs a grounding presence at his side, his own thoughts becoming too much for him. Whatever happens in Reigen's life, Serizawa wants to stand right at his side with him. He wants to be able to see the other be his best self from where it's easiest to see - hand in hand, next to him and with a hopeful look to what's ahead of them.
Without a doubt, he can say that Reigen wants the same for him.
With the way he looks at him from across the office, it's clear as day. The smile tugging at his lips is so small and honest and real that it keeps catching the ESPer off guard. His affection is blatantly obvious in the way his hands travel up the fabric of Serizawa's suit before wrapping their slender fingers around his tie to adjust it. It's the trust that the other gives him, never having shied away from Serizawa's touch or powers. He welcomes them, allowing himself to be coaxed closer and into a kiss by them, not minding the way they make the ground disappear under his feet when the ESPer gets carried away in how their lips slot together perfectly.
He shows Serizawa that he loves him in his tendency to keep insisting that shared showers save water, even though they both know they'll take much longer this way. It shows in the way he relents and allows the ESPer to order his takeout of choice or how he keeps insisting that Serizawa’s shirts are much more comfortable to sleep in. Every look Reigen gives him is filled with something that he knows is pure adoration and it is barely concealed when it's just the two of them, Serizawa noticing how the other seems to get lost in his smiles and laughter more than not.
Reigen squirms in his arms now, interrupting Serizawa’s train of thought by grumbling so quietly that he’s unable to make out what he’s actually saying. He twists and arches off the bed to stretch, something in his lower back popping. It's followed by a sound of discomfort but that doesn’t stop Reigen from fully turning to press his face into the ESPer's broad chest to hide from the rays of sunlight that break through the curtains. Serizawa tightens his arm around the other’s waist, pulling him impossibly closer. His other hand resumes its work of playing with the strands of golden hair, fingers brushing through the locks slowly.
Their legs are touching under the covers and without even a moment of hesitation they entangle, the additional body heat pleasant on this cold winter morning.
Sluggish from sleep, one of Reigen's arms finds its way to wrap around Serizawa's torso, the fingers on the other's hand beginning to trace small circles on the fabric of his worn out shirt.
The action makes Serizawa chuckle quietly, not wanting to disturb Reigen's blissful morning more than the sun had. He does however allow himself to cross the distance to place a soft kiss on the top of his head.
"Good mornin' Taka."
Reigen’s response is something that vaguely sounds like a good morning and Serizawa doesn't doubt that he is struggling with a headache. It's no surprise considering he had pushed past his limit of one drink and had treated himself to a second one.
After another displeased groan, Reigen tilts his head back again. His eyes are narrowed to combat the brightness of the room and his hair is sticking out in all different directions thanks to Serizawa’s attention. With the expression he's wearing, he looks somewhat miserable but the ESPer can't help but find him rather adorable with his nose scrunched up and wearing a sweater at least two sizes too big for him. The fabric hangs off his shoulder but makes him look cozy nonetheless.
It's simple sights like that that make Serizawa's heart jump in his chest with joy and he decides that Reigen being securely wrapped up in his arms, wearing one of his shirts and being warm and comfortable is how every morning should be for them. The fact that Serizawa gets the chance to take care of him is simply an added benefit that fuels an urge deeply buried in his chest with satisfaction.
"Let me get you some water." He whispers, not wishing to be too loud in an attempt to not further disturb the other. "I'll be right back."
When he tries to pull away, however, Reigen’s hand tightens in his shirt, preventing him from going too far.
"Stay. 'S too bright" The complaint is only a half truth, that much is obvious, and Serizawa knows well enough how clingy Reigen can be after a night out, especially if he had a drink and a half too many. Once more he leans down for a kiss, aiming for his forehead this time. The motion is barely a brush, but still enough to make the other lean into it a little.
"I won't be gone for long." He promises, and despite the protests, he manages to untangle himself from their mess of limbs. Reigen turns under the covers, pressing his face into the pillows now.
"You're killing me 'Suya" The other mumbles, pulling the blankets around him tighter, nothing more but a few strands of hair poking out at that point. The smile on Serizawa's face softens at the sight and he can't help but roll his eyes a little and the childish display of displeasure.
"If it weren't for me you'd have had another drink. You should be thanking me for cutting you off." The ESPer says, amusement lacing his voice and he does give Reigen's shoulder a light squeeze through the blanket before heading over to the small kitchen to retrieve a tall glass of cold water. He makes sure it's filled almost to the brim, knowing quite well that the other would need all the hydration he could get to allow his body to recover. Before he returns to the bedside though, he takes a detour to the bathroom to quickly rummage through the storage space behind the mirror, pushing aside his own half empty shaving products to find a sleeve of pain pills.
Quickly, he returns to the other. He places the glass on top of the small nightstand and sits back down on the edge of the bed. When there's no movement from the other under the blankets, Serizawa smiles and scoots closer now, pulling up an eyebrow at the soft and faint snoring. The sight is rather adorable, Reigen's face barely visible but peaceful. With a small huff and a shake of his head, Serizawa manages to pry some of the blankets out of Reigen's grasp to give him enough space to scoot back under them as well.
There is no harm in sleeping in longer today, Serizawa certainly not an early riser either way. Wrapping his arms back around Reigen like promised, he allows his own eyes to fall close as well, resting his chin on the other's head carefully. With the other in his arms and able to listen to his breathing, it's rather easy to grow sleepy again and soon enough Serizawa finds himself slipping in a restful sleep once more.