A/N - I've made Yuma Uke. I did this so it made a made a bit more sense. I can't imaging Yuma ever doing any of the things that I was going to make him do, so I changed it into Kou. It's my first time writing a yaoi threesome so it might now be the best but hopefully it'll be okay 😘)

*STRAIGHT INTO THE SMUT*

"Kouu...." Subaru moaned out his boyfriend's name as Kou gently sucked on his hard nipples. His hands tangled in his bright blond hair, tugging a little when Kou bit into his chest.
"You're so hard Subaru... Naughty boy~" Kou teased, his hands wandering down Subaru's chest to his hard cock, which was straining for relief under the confinement of his black boxers. His face was flushed and his eyes were half lidded with pleasure.

As this was going on, Yuma wandered around the mansion, not knowing what was going on in Kou's room. Of course, he could hear sharp pants but he didn't know what it was, until he walked into the room. Instantly, his face turned a deep shade of red and his pants tightened at the sight. Kou didn't see Yuma, and continued to suck Subaru at a fast pace but Subaru did see him and he was frozen in embarrassment.

"Kou?" Yuma croaked out as well as he could. Kou's head popped up from sucking and looked at the direction of the voice that had called his name. His face was wet with juices, and his chest heaving. "Yuma? How much did you see?"
"I saw you sucking him off."
"Did you like it?" Yuma remained silent, but his erection spoke for itself.
"Oh, seems like you did... Well then." Kou stood up and walked away from Subaru to Yuma.

"Would you like to join us then?" Kou asked, going around to hug him from behind and trail one flat hand down Yuma's toned chest to trace the large bulge forming under his pants. Subaru had a more seductive look on his face as he stood up and whispered in Yuma's ear.
"Do you want us to make you cum, Yuma?" Yuma could hardly reply, his lips had opened to reply but all that came out was a small groan.
"What was that? Speak a little louder Yuma. Do you want us to make you cum?" This time Yuma responded with yes.
"Then you'll have to be a good boy for us. You need to do what we tell you too." Kou giggled, slipping his hand up Yuma's shirt and tracing his V-line.
"Don't touch yourself." Subaru told him, biting gently on his earlobe
"And don't cum unless we say you can"

Subaru lead Yuma to the bed and made him lie down, with his back against the black headboard. His eyes wandered back and forth between the two males infront of him, not knowing who look at first. Subaru reached forward and grabbed Kou, bringing him close into a deep and passionate kiss. Kou kissed back, gripping some of Subaru's hair and pulling at it, making him moan at the feeling. "Fuck.." Yuma quietly growled, wanted to pin one of them down and roughly pound into them. He saw them pull away for breath, and then Subaru leaned down and teasing licked the end of Kou's throbbing member.

Subaru kissed down from the tip to the base of Kou's cock, occasionally licking up the side or around the top. Yuma watched helplessly, his own member twitching in excitement and arousal from beneath his clothes. Subaru continued to suck and lick at Kou's cock, and it took everything not to get up and take Subaru as his. Just seeing the two males making love was enough to drive him over the edge. Quietly, Yuma undid his button and the fly of his jeans, then pulled his member out of his boxers. He stroked his cock slowly at the sight of Kou and Subaru doing their thing together, growling slowly. Subaru did notice and pulled away from Kou.

"You're naughty, Yuma. We told you not to touch yourself but you did it."
"We have to punish you now." Kou purred seductively, standing up from the bed, and also grabbing some black ribbons from the drawer. "What are you doing?" Yuma questioned, still stroking slowly.
"You didn't listen to our rules, and now we have to give you a punishment." Kou set about tying Yuma's hands to the bedposts so he couldn't move. Then both of the males leaned down to slowly lick and suck at Yuma's member.

Yuma pulled and clawed desperately at the ribbons holding his arms up. He so badly wanted to push them down so his cock penetrated their throats, but he was restricted. Both Kou and Subaru took other sides of Yuma, kissing up and down, and running their tongues along his sensitive slit. "More!" Yuma cried out, bucking his hips up towards their faces.
"No no no Yuma. This is your punishment."
"Please..?!" He whined needily.
"Please what...?" Kou pulled away and sat back on his knees.
"Please Masters."
"Good boy. I think you deserve a reward for that."

Kou crawled forward and sat on Yuma's lap and kisses him forcefully, which Yuma gratefully received. As they kissed, Kou slid his hands up Yuma's shirt, playing with his nipples and tracing the hard lines of his abs. Feeling the stimulation, he moaned a little into the kiss, giving Kou the chance to push his tongue into his brothers mouth. Subaru continued to suck at Yuma's member slowly, staring at Kou's ass from where he was sitting.

"Subaru! Gonna cum!" Yuma twitched uncomfortably in his restraints, bucking his hips up into Subaru's mouth. But just before he could release, Subaru pulled his mouth away from Yuma and stood up. "Why did you stop?" He asked, whining a little bit.
"Because it's your punishment. We won't let you cum until you beg for it." Subaru smirked. His more seductive and alluring side had come out.
Yuma replied, "I don't beg for anything."
"Oh believe us, you will beg for it."

Kou got off of Yuma's chest and sat on the sofa while Subaru lowered himself onto Yuma's still hard and throbbing member, impaling himself with it and moaned quietly. Yuma so desperately wanted to break the chains and make Subaru ride him quickly, but he couldn't do anything but the slow pace that Subaru was going at. Several times, he bucked his hips up and deeper into Subaru and both of them moaned quietly at the friction. He rode Yuma at a medium pace, crying out when his prostate was hit, and then started to ride even faster. While this was going on, Kou quickly pumped his fingers in and out of his own hole, biting his lip hard and stroking his member at the same time. He let out a large cry as he came into his hand then proceeded to lick away his cum.

Yuma was close again, so was Subaru. They had all long forgotten the rules and untied Yuma's hands from the headboard of the bed. Yuma instantly went to grip Subaru's hips and make him move faster, both of them panting heavily and groaning. Subaru came first, shooting his load onto Yuma's chest, and Yuma came deep inside of Subaru's ass. Kou shot up from the sofa and crawled on the bed, then turned around and spread his ass cheeks with his own hands. His hole was already wet with arousal and some of his own cum. "Fuck me now Yuma. Please." Yuma obliged and easily slid inside of Kou. Kou grunted and arched his back, lying on his stomach with his ass moving with each of Yuma's thrusts.

"I hope you know how hard I am going to fuck you for stopping me from cumming." Yuma growled, thrusting faster and spanking Kou hard. Kou whimpered and moaned gently; he gripped at the bedsheets. There was a large red hand mark where Kou had been spanked, which would most likely turn into a bruise, but nobody cared. All they cared about was the red hot pleasure burning through each of their bodies. "Yuma! I'm gonna cum!" Yuma took this as a signal to thrust faster than before, and also read down to stroke Kou's member in synch with his hard thrusts. "Oh god! Yuma~ Mmmahh! I'm cumming!" Kou released violently onto the bedsheets, Yuma cumming just after him. "Fuck..." Yuma grunted, pulling out of Kou. He spanked Kou another time, and then lay back on the bed.

"Hey Kou, Subaru" Yuma asked.
"Yeah?" They both replied, Subaru sitting on the sofa and Kou sitting back on his legs.
"Round 2?"
"Round 2."

Next chapter: Ayato X Reiji (Fluff)