Chapter Text
Shu remembers when Asuka presented as omega. He remembers Asuka looking so forlorn the day the results came out. Usually, when Asuka walked by his store, there was a conversation to be had or a story about his day to be told, but that day there was nothing. Asuka walked by and didn’t say a word. Shu could tell Asuka was disappointed to be whatever he was, and later when he learned Asuka was an omega, it made more sense.
But Asuka brushed it off after a while and became his normal self, carrying himself with the usual confidence and jest.
When Asuka reached his last year in high school, he started pushing himself more toward Shu in a flirty way. Shu could tell but didn’t want to reciprocate, believing Asuka could never see him that way. Until it went on to the point where he gave in and realized how important Asuka was to him and how much he wanted to be with him.
Then they got together. Shu, an older beta, with Asuka, a younger omega. Shu slowly realized the problems that might occur from them being together. There were things he could not provide. The pheromones, the knot, the stamina. Shu, at the beginning of the relationship, was worried about the biological struggles that would occur from them being them .
However, Asuka showed him that it didn't matter. Asuka never brought up the topic of secondary gender or sex or biological needs of his. Asuka just took him around and made him happier than he could be. It was like nothing changed. They were the same as before, just now…dating.
Until he ended up under an in-heat Asuka. Then something in him changed.
“Asuka?”
“Shu.” He said it with such conviction. “Let’s make love.”
“What-”
“Shu,” Asuka leaned closer down to him, enough for his smell to get on Shu, “I really can’t ignore that I want you.” He sighed his hot breath all over Shu’s neck and ear. “I try not to bring it up, but Shu- I need you inside me I can’t-” He stopped and pressed his head to Shu’s neck. “This heat, I can’t take it anymore.” He lay there on top of Shu, breathing heavily and twitching his hips every so often, wanting to move but waiting for consent even in his heat-driven mind.
Shu of course wanted Asuka. He wanted to run his hands across Asuka’s whole body and squeeze and rub wherever felt good and stirred him further into his release. He wanted to thrust and ruin Asuka from the inside out. But he can’t knot or ease the heat’s pain.
“Asuka, I can’t do much, I’m not an-”
“Not an alpha, I know.” Asuka lifted as high as he could and reached for something in his bedside drawer. Shu only saw a plain bottle of lube, but then Asuka explained, “This lube gives a similar reaction to knots, meaning if you fuck me with this and get this lube and your cum deep in my ass, my heat eases.” Asuka looked so desperate and needy. His face was so pink and his skin so hot. He wanted Shu to mess him up.
Shu grabbed at Asuka’s hips and ground their hips together. “You want this?”
Asuka lost all his breath and dignity and started to beg. “Yes!” He ground his hips rough into Shu. “Yes!”
“This isn’t your heat talking?”
“No! Shu, let’s make love, please!” Asuka leaned in and kissed Shu, sloppy and wet and whining for more. “Shu-kun!” His hips kept at it and he explored Shu’s mouth. Shu opened and let Asuka do as he pleased with his mouth as Asuka ruined their pants with precum and slick.
Asuka was in pajama shorts and a t-shirt when he came over to his house, but now the clothes were begging to be torn off. His shirt was so loose Shu just wanted to pull it off already, and the shorts had a waterfall of slick forming.
Asuka cried out as Shu rubbed himself even harder against Asuka to cum together. Soon they came and ruined their pants altogether.
There were small tears Shu wiped off for Asuka, before turning him over to his side and taking his clothes.
Asuka didn’t lift a finger at all and got everything taken care of by Shu. He lay there and became naked and spread out by Shu, who quickly tore off his clothes too.
Asuka was gushing out and felt it. He felt wet at his ass and the wetness felt cold because of the air. Unfocused and hazy, he then came back to reality as he felt his boyfriend’s fingers pry at his whole. He gasped and focused on the feeling. The way his anus was so loose, wet, and gaping for Asuka. He was amazed at his own body being so ready and open for sex just because he was in heat. He wanted to know how it felt with Asuka inside him and scraping against his inner walls and pushing his cock into him and ruining and filling him.
“Get in me. Make love to me, Shu-kun.”
“Do we need a condom?”
“I’m on a pill! I got ready and prepared everything so there’s no risk. Unless you want…a baby?”
“Asuka,” Shu chucked and leaned in close, “We’ll wait a long time for that. For now, just think about how I’m going to ruin your little virgin ass with my cock.” He leaned into Asuka’s ear and whispered, “In a few years, I’ll fuck you so much you’ll be pregnant every year. Right now, just focus on how much you’ll want to be hopping on my dick once you feel how good I’ll fuck you.” Shu leaned back and smiled softly.
Asuka couldn’t believe his man could even utter something so disgustingly hot. Shu, who’s acting like he didn’t rearrange Asuka’s mind, moves comfortably within Asuka’s thighs and pours some of the special lube on his anal area.
Asuka gaps a little from the cold touch but stays tense when he realizes what will happen. They’ve never been this close before. He tried to keep himself from wanting too much Shu. They already had a big age difference and Asuka wasn’t the most manageable person- not to mention how he had biological needs he didn’t want to force Shu to take care of. He was tense and sweating from not just the heat. His blood was pumping and kept him so hot as Shu leaned down and enveloped him.
“Are you okay?”
He nodded.
“I’m about to go in. Okay?”
“Yes.” Asuka moved his hips forward and grabbed at Shu's arms that held his hips. “I’m ready.”
Shu looked at him before looking down so he could push in. He pushed the tip in and let it ease into Asuka. The omega just soaked it in and felt the pressure of it. He felt himself open up and his tension started to fade. Asuka felt the tingly feeling of pleasure and wanted more. He arched his back and leaned his hips closer to Shu. His man saw that and moved further in, quicker than before and Asuka loved it. He breathlessly cried out as his anus stretched around the big dick. He was shocked but wanted more and leaned in more, chasing the feeling. “Shu!” He didn’t know if it was it, but he felt the pace of Shu suddenly thrust into him and hit against his ass.
Asuka jumped and threw his head back, crying out as he arched his back. It stung honestly. He was stretched so much and so full and it hurt but he liked it. He cried out for Shu and Shu just pushed forward into him.
Shu pushed his dick and rammed into Asuka. He felt Asuka's anus against his dick like a tight ring around his cock forcing his cum out. He barely got in but he wanted to slam cum in him and watched the white fill Asuka before spilling out. He wanted to watch pleasure and pain on Asuka's as he thrust into him.
"Keep moving!" With tears down his face, Asuka cried and thrust his hips back into Shu, wanting so desperately to reach his high. He had always wanted Shu inside him. Ever since he presented as omega, he knew the only man he wanted to fill him and relieve his heat was Shu. He wanted his dick cumming inside him for days on end. He always imagined the length and girth of Shu's dick. He wondered how it would feel hard inside him and how it would feel for Shu to spill his seed into him throughout his heat. He always wondered, but now, with it thrusting inside him and making his body jump and squeeze, he knew this dick was perfect for him.
They stayed at a quick pace and held each other so tight. Asuka could only praise and beg to Shu keep fucking his big dick into him. “Shu! It’s so good! It’s too good Shu! Ah! Ugh! Ah!”
Shu stopped thinking straight. He never wanted to experience sex with Asuka because he knew he would live with his dick stuck in Asuka’s ass if they did it even once. Asuka was too tight and too pretty and too good to fuck into and get all messy with. He tried so hard to keep his dick in his pants once they started dating. He tried not to ruin Asuka but oh god, now he was never going to look back.
Shu’s hands were clamped onto Asuka’s hips, with no chance of letting go, with how blissful and damn fucking good it felt inside of Asuka's deep, wet, tight hole. Once Shu entered and felt the tight ring slide down his cock and tease him toward pleasure, he knew he would not be the same. Shu kept ramming and slamming into Asuka, relinquishing in the feeling of getting nearer and nearer with every pound against his boyfriend's ass.
He felt his climax near, and with how Asuka had tightened around him, he knew Auska did too.
“Asuka.” He let out, shaking from still pounding into the omega. “Cum with me.” Shu started to fall a little, wanting to get closer to Asuka’s crying face.
“Shu, ah!” He felt himself about to burst.
Shu let go of one side and the hip and put his hand next to Asuka’s head, still pounding messily. Shu wanted to see how pleasure and intensity painted themselves on Asuka’s face when he came.
He felt himself burst and shoot into Asuka. He saw Asuka’s shock and how the cum in him only made him climax quicker. As that warmth spread inside and filled him, he came. He shot into the space between them and his anus tightened around Shu. His anus clenched but he also reached for any part of Shu he could reach, pulling the man closer to him and moaning into his ear.
They turned out with Asuka hugging Shu’s back and cum all around them. Cum seeped out of Asuka and he liked it. He felt inside him and felt how there was too much. He knew it didn’t mean much, but there was so much cum and he felt like that meant Shu liked it a lot.
Shu loved the feeling. His now soft dick was enveloped in warm, wet tissue, it felt nice after hitting so hard in the deepest part of Asuka. But Shu still knew he should disconnect themselves and rest. He slowly slid out and then lay next to Asuka.
He spooned Asuka and they rested together.
“Shu-kun?”
“Yes?”
“Do you think you can go for one more round?”