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Kiyoomi didn't understand how people liked overstimulation.
Seconds after coming, he would beg Atsumu to pull out. He'd whine, squirm, and moan, trying to get away. The tears in his eyes would spill over and his nose would run, making his whole face wet and disgusting.
Dutifully, Atsumu would pull out and jack himself off, never taking too long before his cum would spray out onto Kiyoomi's stomach, face, ass, or pussy.
It was a pretty good system. Atsumu loved to see Kiyoomi covered in his cum, and Kiyoomi didn't collapse.
He didn't see why they would do anything else.
-----
"Right there, fuck!" Kiyoomi's hands scrabbled to grab onto the sheets below him. Atsumu's cock was hitting all the right places inside of him, and his fingers in Kiyoomi's ass made him even wetter, dripping onto the bed.
"You close, baby?"
Kiyoomi nodded frantically, but Atsumu slapped his ass.
"Say it out loud." He slapped his ass again and Kiyoomi whimpered.
"Yeah, yeah, I'm close, don't stop, please, please, don't stop."
Atsumu continued fucking him. "I'm close too, baby. Can you handle me fucking you until I finish today?"
Kiyoomi shivered. He was feeling cock dumb, but he knew that would mean overstimulation. He always came first.
But Atsumu didn't ever take much longer than him to come, and that was when he was jacking off. He probably wouldn't even last a minute if he were inside Kiyoomi's pussy. He said he was close, after all. Kiyoomi could handle it.
"Yeah, want your come. Fill me up."
Atsumu groaned and spread his fingers in Kiyoomi's ass, reaching around with his other arm to circle his clit with his thumb.
With a squeak, Kiyoomi came, panting as his pussy pulsed and squeezed around Atsumu's cock.
His eyes rolled back as Atsumu kept going, stretching Kiyoomi's orgasm out as long as possible.
Eventually, he came down, Atsumu still rubbing at his clit and fucking him. He squirmed, smacking Atsumu's hand away from his clit. He was too weak to reach back and do the same for Atsumu's fingers in his ass.
"Ah, ah, Atsumu, too much."
Atsumu kept fucking both of his holes, but he kept his other hand away from Kiyoomi's clit.
"You said I could finish in you, baby. Don't tell me you were lying."
Kiyoomi shook his head. He still wanted it. "Fuck, just finish already." His pussy kept throbbing. It felt too good. It felt like too much. He couldn't take it for much longer.
Atsumu grunted. "It's gonna take some time, baby. Jacked off in the shower earlier."
Kiyoomi whimpered. He felt like he was going to collapse.
"You--you said you were close."
"I lied." Kiyoomi could practically hear the grin in his voice. He kept talking. "You don't know how sexy you are like this, honey. Crying and whimpering, drooling from your pussy and mouth. Let me have this."
Kiyoomi could feel the wet spot beneath his face as he shook his head.
"I know you like this, Omi. You just need someone to not listen when you've said you've had enough."
Kiyoomi panted. His nose was running; he could only breathe from his mouth.
"I can't, I can't."
Atsumu hummed. "Your pussy can't take my cock anymore?"
He shook his head again, mussing his curls against the sheet.
"No, no, can't take it, fuck."
Atsumu kept going. "You said you wanted my cum, though."
Kiyoomi trembled. He could barely think. He couldn't think of a response.
Thankfully, Atsumu did the work for him.
He pulled out, but Kiyoomi’s relief was short-lived. Atsumu flipped him over, stuck his cock in Kiyoomi's ass, and started pounding again.
It was a little better. At least his cunt was left alone. He could take it.
Kiyoomi could see Atsumu reaching for something.
"You said your pussy couldn't take my cock anymore, but how about a toy?" Atsumu slipped something in Kiyoomi and turned it on, making Kiyoomi feel the vibrations from inside out.
Kiyoomi thrashed beneath him, but Atsumu held him steady. He couldn't escape. The toy was stimulating his pussy and his clit, and he could feel Atsumu's cock rub against it through his walls.
He panted and squeezed around Atsumu's cock and the toy. It made everything more intense, but hopefully Atsumu would finish faster.
"A-are you close?" Kiyoomi asked desperately.
Atsumu snorted. "You feel like heaven, Kiyoomi, but I'm not letting this go to waste. This isn't ending anytime soon."
Kiyoomi let out a sob as he felt a second orgasm building. It wasn't fair that he was going to come multiple times in the time it took Atsumu to have one orgasm. He couldn't take it. He squirmed again, trying to get away, but he felt too weak, his struggles barely even noticeable to Atsumu.
After a minute of trying to twist away, Atsumu noticed and decided to stop Kiyoomi by changing positions. He lifted Kiyoomi's thighs and pressed them next to Kiyoomi’s sides, against the bed. Kiyoomi whimpered as the new angle made him tighten against the toy and let Atsumu fuck him even deeper.
Atsumu leaned down and sucked a hickey onto Kiyoomi's neck before sitting back to admire him.
Kiyoomi knew he looked like a complete mess. He felt like a wreck, and Atsumu wasn't picking up speed or showing any sign of needing to come.
"You look so gorgeous like this, baby. It makes me wanna tie you up, put a couple of toys in you, and just sit back and watch you for a couple hours."
Kiyoomi wouldn't be able to do that. It had barely been five minutes of overstimulation with Atsumu, and he already felt like he couldn't take any more.
Atsumu leaned down to suck another hickey on Kiyoomi's neck, and in doing so, pressed against the toy, pushing it right into Kiyoomi's g-spot.
Kiyoomi couldn't even moan as he came again. He threw his head back, gasping for air as pleasure overwhelmed him.
The orgasm went on for too long, and Atsumu and the toy's pace didn't change at all. There was no respite, no moment for him to catch his breath. Just brutal fucking.
"Fuck, that felt good, baby. You tightened up like you wanted to strangle my cock."
Kiyoomi shook his head, but he couldn't try to break away, couldn't even talk.
"Oh, shit. Look at that."
Kiyoomi didn't look, but all of a sudden the vibrations from the toy doubled. He didn’t know vibrators could be this powerful.
It hurt. It felt like heaven and hell. He couldn't take it, but Atsumu was going to make him take it anyway.
"Please, please, please, please." Kiyoomi didn't even know what he was begging for. Atsumu was jackrabbiting in him, finally appearing close, but he seemed to be waiting for Kiyoomi to come again.
"I can't, just come, please, fuck." Atsumu grinned and used one of his hands to push the toy in and out of Kiyoomi, fucking both of his holes at the same time.
Kiyoomi saw stars as he came again, not even a minute after his previous orgasm. He faintly heard Atsumu groan, and felt his dick pulse in his ass. He used all remaining strength to push the toy away from himself when he had finished, and Atsumu didn't stop him, turning the toy off as he helped Kiyoomi take it out.
Atsumu pulled out right after the toy, the movement making Kiyoomi gasp. Everything felt like too much. He tried pushing away, but Atsumu stopped him.
"Woah, baby, you were gonna roll off the bed. Don't worry, it's over now." Kiyoomi trembled, shaking his head, unable to resist as Atsumu wrapped him up in a blanket and spooned him, arms around his chest.
"You were so good for me, Omi. So perfect." Atsumu kissed his cheek. "I love you so much."
Kiyoomi tried talking back, but he couldn't. He just made a bunch of jumbled sounds. Atsumu rubbed his arm comfortingly.
"It's okay, baby, you don't have to talk. Go ahead and take a little nap. I'll wake you in a little bit so you can wash up."
Kiyoomi tried to agree, but he still wasn't able to. He didn't have the mental capacity to stress out about it, though. He just closed his eyes, safe in Atsumu's arms, and drifted to sleep.
-----
He woke up to gentle kisses and Atsumu calling his name. He opened his eyes blearily and hummed. Atsumu was smiling at him.
"Hi, Omi. Feeling okay?"
He cleared his throat a few times, trying to wake his brain up.
"Yeah. Wanna bath."
Atsumu nodded, stepped out of bed, and picked Kiyoomi up, still in the blanket. He walked them to the bathroom, placed Kiyoomi on the toilet seat, and started the water, only taking the blanket off of Kiyoomi and putting him in the bath when it was ready.
He stayed by his side, washing Kiyoomi up and making sure that he stayed awake.
Just as Kiyoomi was about to drift off, unable to resist the temptation of sleep, Atsumu pulled the plug, dried him off, tucked him back in the blanket, and carried him to the bed. He tucked him in under the sheet and comforter before getting in, wrapping himself around Kiyoomi.
Kiyoomi felt warm.
He managed to mutter out "Love you," and he heard Atsumu echo it back before he drifted off to sleep again.