Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/ works/5294408. Rating: Explicit Archive Warning: Underage Category: M/M Fandom: 終わりのセラフ_|_Owari_no_Seraph_|_Seraph_of_the_End Relationship: Hyakuya_Yuuichirou/Kimizuki_Shihou, Hyakuya_Yuuichirou_&_Kimizuki_Shihou Character: Hyakuya_Yuuichirou, Kimizuki_Shihou Additional Tags: Smut, A_little_fluffy, rarepair_hell, Birthday_Sex Stats: Published: 2015-11-27 Words: 1648 ****** were those shorts really worth it ****** by blushingprince Summary it's kimizuki's birthday and yuu wants to surprise him with a little special something based off tumblr user maqui-chan's kimiyuu art Notes See the end of the work for notes How did he end up in this position? Fuck. Yuuichiro knew he was an idiot. Everyone already always told him that. Why did today have to be the day he would prove it?   Kimizuki continued to stare at him. God, he felt so exposed. The air in the room wasn’t moving but he could feel the cold biting at his exposed thighs, the fabric tight around his ass. There he was, ass facing his boyfriend, in the shortest pair of shorts he’d ever donned. What else could he have done? He’d forgotten it was the asshole’s birthday and when he panicked he found thispair of whatever you call them in his closet. He wanted to make Kimizuki feel good, yeah, but they hadn’t exactly gotten that far. Goddamnit! This was so embarrassing. What if he just kicked him out, and left Yuu there in the cold?   But Kimizuki only continued to stare. “What did you say?” he finally managed to cough up.   “I’m…..I’m your present, dumbass. Happy birthday” He was sure he was bright red by now, beyond the pink of Kimizuki’s hair.   He couldn’t have been prepared for his boyfriend’s response. He knew Kimizuki was an ass…..   “Great. Can I have the receipt.”   Yuu was just about to get all pouty and throw a scene when he recognize the pink snaking across Kimizuki’s cheeks.   “You asshole! Liar! You’re turned on, by me!!”   Kimizuki held a blank expression on his face, even if there was a slight blush. He slowly covered his hand with his face. Never would he have thought the day would come where Yuu would try to seduce him like this.   What was he supposed to do?   He sat down on his bed contemplating his options. What options? God this is so embarrassing. Why did Yuu have to be so reckless with everything he did?   Yuu had joined him in the meantime, sitting next to him but maintaining distance. “Oi….if this was too much, I get it”   Wait that’s not what I meant -   “I can go back to my apartment, it’s okay”   That’s not what he meant, stupid Yuu! Yuu was always so stupid…...If he could just lean down….maybe if he actually did...oh wow he actually is. He’s actually kissing Yuu. He doesn’t know why he’s so surprised. They’ve done this a lot before.   But Yuuichiro is surprised at Kimizuki’s kiss. He’s usually so gentle like he isn’t sure what he’s doing but now he’s rough and hungry, his fingers pliant as he holds onto his boyfriend. Kimizuki slides a tongue into Yuu’s mouth, opening him up and Yuu lets out a moan to show this pleases him. It’s all at once and sudden but Yuu likes this very much.   “Kimizuki,” he huffed, “do you wanna...go all the way today?”   Kimizuki felt like he was in some sort of shitty teen romcom but looking at Yuu - the way that flimsy tshirt clung to him, his chest heaving in and out roughly, those tight shorts straddling his muscular thighs - there wasn’t much to care.   “Yeah, I wanna” he responded, gruff and still out of breath from the kissing.   “Yuu, come here, like this” Kimizuki pulled gently on Yuu so that he climbed up on his lap. Kimizuki could feel his heart shudder. He had thought about this moment - hell even touched himself to it - but to think it was actually happening? He licked his lips. What should he do first?   Too late. Yuu caught him in another kiss, biting his bottom lip. Yuu was always so impatient, just like a little kid. Kimizuki used both hands to slide them up Yuu’s thighs - the center of attention - and grab at his tight ass. Yuu’s tiny shocked voice was his reward. “I think” he started, “that we better get your clothes off”   With Kimizuki’s help, Yuu was able to get his shirt off. Come time for his shorts, and he slid them off in his own dorky way then seeking refuge for the bed.   “Kimizuki you nerd! Are you going to keep your clothes on?”   “Tsk. Always so impatient” he mumbled, not really upset. He shrugged his shirt off and climbed on top of Yuu. Their lips met for another kiss, just as hungry as the ones before. This time though Kimizuki got a little bolder and began to trace little butterfly kisses downward and across Yuu’s shoulders. It earned him a brilliant laugh. Exploring a bit more downwards, he found a nipple, and licked it tentatively. Yuu responded well, squirming and gasping out in pleasure. He continued in the pursuit, playing with the pink appendage and teasing it. Yuu’s gasps were small and cute   “C’mon Kimi! Get down to where it really matters!” Yuu demanded and Kimizuki couldn’t help but find it funny.   “Do you really want me to, that badly?” he teased, lowering himself so he hovered over Yuu’s lower half. He gently placed a hand on Yuu’s boxers, seeing that Yuu was watching him, and began to palm him through the fabric.   Yuu groaned loudly. He’d never quite felt a sensation like someone else touching his dick. And yet, Kimi hadn’t even touched him yet. He knew he was pretty hard already. Kimizuki always acted like he knew everything, but did he really know what he was doing? They were both novices. Who cared. Kimizuki was touching him. It felt good. Nothing else really mattered.   Kimizuki reached on either side of Yuu’s boxers and slid them down, pulling them off. Yuu’s erect cock popped out. Oh my God is he going to touch me.   It’s not that Kimizuki wasn’t nervous, but he had thought about this for such a long time, in so much length, and he wanted Yuu to feel good so badly.   He reached gently for Yuu’s dick and wrapped his fist around it. Yuu threw his head back, groaning. Kimizuki fingered the cockhead with his thumb, trying to figure out what would feel best. He slowly pumped up and down, watching Yuu’s reaction and heavy breathing. But he didn’t plan on Yuu coming from this….There was a tube of lube in the drawer and Kimizuki had other hopes for the night.   “Hey Yuu”   Yuu grunted. “Yea?”   “How far do you want to go?”   What type of question is that to ask while you’re holding your boyfriend’s dick?   “All the way...I think”   For a second Yuu thought that Kimizuki had given up, as he’d pulled away from him. But it was only then that he’d realized that his boyfriend was even more prepared than he knew.   Kimizuki returned to give Yuu another kiss on the lips, a sweet and gentle reminder of his feelings. “I have to um….prepare you now” he mumbled.   “Look at you, being shy” Yuu teased”   “Shut up”   Kimizuki got on his knees and spread Yuu’s legs apart. God those legs were nice… Squeezing some lube out onto his fingers, he rubbed them together and looked at Yuu’s entrance.   “Are you….ready?” he asked, tentative.   “Fuck yea. I’m always ready”   Kimizuki began to gently massage Yuu’s entrance, earning him numerous sounds from his boyfriend he’s never think he’d hear. When he began to push a finger in, Yuu grunted and clenched. Kimizuki tried to move around. He added another finger, unsure of what he was really doing. He had only really read of these things on the internet. He tried splaying his fingers out and Yuu wasn’t too sure how he felt about that. When the third finger came in, Kimizuki wasn’t sure things were going to work. He added more lube and kept massaging Yuu, who assured him he could take anything.   At last, Kimizuki retrieved more lube and spread it on his dick. Yuu was on his back with his legs pushed back, looking very enticing, but Kimi had other things on his mind, being rather nervous about it all. He pressed his cockhead up against Yuu’s entrance. He pushed a bit inside, to test what it was like. Both he and Yuu reached for their breath.   “Are you okay?” he asked, running a hand through Yuu’s hair.   “Of course. You can keep going”   “Alright then”   Kimi pushed more inside. He knew it felt so good….but he didn’t want to revel in it. What if it didn’t feel the same for Yuu? Pulling out and pushing in again. Tiny bit by tiny bit. Making sure Yuu is okay.   “Hey Kimi?” Yuu asked, pressing a gentle kiss to his shoulder.   “Y’know uh….if you want to…..you can go harder”   “I’m!!! I’m just trying to make sure I don’t hurt you”   “Hmmm maybe I have an idea”   A few minutes later and Kimi was sitting up with Yuu literally climbing onto him.   “Let me just lower myself onto you”   It must have been a good plan, because it worked. Yuu was thrusting himself up and down at a fast pace, riding out Kimizuki well. Kimizuki got into it too, too aroused to care, thrusting himself up into his boyfriend. Yuu latched himself onto Kimi, biting whatever neck and shoulder he could reach. The two of them moving their bodies up and down reached a somewhat workable pace and God Yuu was loud when he moaned. Kimizuki kept hitting that spot over again and again and Yuu went wild.   “I’m going to cum” Yuu managed to breathe.   “Me too”   It was only a matter of seconds and Yuu came in wave of pleasure he’d never met before, head thrown back, eyes dialing, body shaken, cum shooting in bursts over his abdomen, and letting out a scream. Kimi kept thrusting into him until he too, came, spilling himself inside Yuu and moaning hard. They collapsed onto the bed, Kimizuki pulling out and pulling the covers over them.   “So” Yuu asked, “were the shorts worth it?”   “Oh my god. Shut up”     End Notes ahhh thank you for reading i haven't written smut in a while but this was kinda fun i feel like i couldve done a better job with the actual sex tho as usual, im open to prompts Please drop_by_the_archive_and_comment to let the author know if you enjoyed their work!