MAJOR SMUT! Don't worry though, Gon and Killua are 18 and 19 in this One Shot. Still read at your own risk!
Killua looked into Gon's eyes. Though Killua was not much taller than he was (He only beat him by an inch or so.) He was still the one to take control. He was the dominant one, that was pretty clear. It was always apparent to him that he was, and the way Gon looked into his eyes made him believe that even more. Gon's mouth partially open with his glimmered chocolate brown eyes, he looked submissive. He also looked like he was waiting for Killua to keep going, so that's exactly what he did.
Killua put his hands on Gon's shoulders, slowly pushing him down onto the mattress. It made a small drawn out creak as Gon sat onto it and laid back. His face was bright red, extremely red.
They were both wearing white beaters, they usually did either casually or when they trained/worked out, so Gon's tinted red shoulders were exposed as well as some of his stomach which was barely shown by the fold in his shirt. Killua smirked down at him, giving him loving eyes. He began to slip off his own shirt already, becoming impatient with himself.
"I've never done this before.." Gon said in a low voice
"I know, I've never either." Killua leaned forwards once his shirt was completely off. He dragged his hands down Gon's torso and to the bottom of his shirt "Just leave it to me, i won't hurt you."
Now that both of their shirts were off, both of them examined each others torsos. Of course they've seen each other shirtless, but in this situation it was arousing.
Killua's body was thin and lanky, where his chest was hard and his stomach was in the process of forming abs. His V-Line was pronounced, but he did have his faded scars. Not like that bothered Gon, though.
Gon's body was a little more muscly as expected, since he did use more brute strength in battles to where Killua relied more on skillful quick attacks along with his electricity. Gons chest seemed more broad, to where his abs were more shown, Killua has always been the skinnier boy anyways. Nevertheless, they both found each others bodies more than attractive.
Killua snapped out of the starring, and leaned forwards. He pecked kisses all over Gon's neck and chest, lightly biting some places and leaving love marks. Gon giggled a little as expected from his cheery self, putting his hand in Killua's hair and running his fingers through the soft thickness of it.
"You're adorable..~" Killua said softly as he gave Gon a kiss on the lips, a long dragged out one to where they were pressed up against each other hard. Gon let out a tiny moan, it was kind of feminine and high since Gon had a higher voice. Killua's eyes widened a little as he quickly shut them again, he always wondered how Gon moaned, and now he wanted to hear more of it.
Killua's hand dragged along Gon's body as Gon had his right arm wrapped around him with his hand in his hair clenching it.
Their bodies were pressed up against eachother as well, Gon decided to wrap his legs around him too and start to grind. It was a feeling neither of them have ever felt before. His tight crotch rubbing through the fabric at the others dick was a new pleasure. Both of them moaned out a little from this, already extremely turned on.
"I'm getting hard fast.." Gon whimpered
"I can feel it." Killua let out a chuckle.
Gon's hands let go of Killua, using them to scoot down his shorts. His erection was slowly revealed as Killua stared down, seeing his dick desperately poke up in his boxers. Killua helped Gon take off his shorts all the way, beginning to take off his own.
Gon watched in a trance, he was getting hornier the longer this was being dragged out, and he wanted him inside of him already. Though he was scared, he wanted it badly.
Killua stared down at him with his pale and lustful blue eyes. He looked dominant.
Killua bit his lip, slipping down his boxers to reveal his cock.
Gon's eyes widened as his already red face some how turned even more red.
"You look like a tomato-" Killua commented as he let out his snarky giggle.
Killua began to take off Gons boxers for him
"Yeah well you can't blame me, just look at you."
Killua gave him a smile before looking down at Gon's dick.
Killua has walked in on Gon naked before, but this just felt so new to him. All of this. He never expected for Gon, his best friend, to be laying beneath him wanting to be fucked by him. Not like he was complaining though.
Gon spread his legs wider "Please, it's starting to hurt.."
Killua's eyes widened as he put his pointer finger and middle finger in his mouth, taking it out with a small spit string. He began to rub around Gon's asshole and dick area, Gon kicking his legs a little in excitement and pleasure as he started to murmur words.
Killua had his knees on the bed as he was standing on them, in-between Gon who had his legs very far apart.
He took his other hand and began to rub Gons cock up and down, getting even more noises from the black haired boy.
"Please! More.." Gon was slurring as he felt his dick being pumped by one hand and his asshole being massaged by the other. Killua was rock hard watching this, and he loved to hear Gon's noises.
"You're ready for this?" Killua crawled up a little, grabbing the backs of Gon's knees as he guided him to put his legs over his shoulders.
Gon gulped, his breaths were shaky. Killua hid his nervousness better. "I'm ready.." Gon said with a sharp breath.
Killua positioned himself at Gon's hole, pressing in it began to squeeze in. Gon already felt himself expanding as he started panting. "I- Ah~ Oh my god.." He felt Killua's warm cock sliding in to him. The saliva helped it go in better.
It was half way inside of Gon as he was already whimpering and calling out for him to start thrusting. Killua let Gon get used to his size, leaving it in as he kept pushing in only a little bit. Once it was in all the way, he slid out fast.
"Killua!~" Gon moaned out
Killua snickered as he pushed it back in, a small wet sound was heard. Killua began to pick up the pace now. Pushing in and out as Gon began to whimper and moan more. Killua grunted as he kept humping him.
Gon put his face into Killua's neck and bit down roughly, This didn't hurt Killua but only turned him on more. Sloppy kisses and rough bites painted Killua's neck.
Killua clenched one of Gon's thick thighs as Gon was clenching Killua's shoulders.
Fingernails sunk into Killua harder as he began to pick up the speed more, trusting in and out fast and sternly. He felt Gon's hot breath on his neck as drool dripped from it. His eyes were low but full of lust, as he now felt a hand on his ass with a squeeze. He looked down at Gon and stuck his tongue out, in response Gon gave him a sly face through all his moaning and mutters."You're so tight..~" Killua moaned out as he was rolling his hips now, It was slower but felt as much pleasurable.
Gon's leg twitched a little from the mesmerizing pleasure he was feeling. As Killua thrusted hard. "Gon~ Fuck~" The backboard of the bed repeatedly hit the wall, along with the smacking sounds of Killua's hips hitting in between Gon's legs. "Killua~ More~." Gon was drooling from the sides of his mouth at this point as tears rolled from his eyes. Killua started to make-out with Gon. Their tongues fought for dominance as Killua won, he stuck his tongue into his mouth as he played around with it. The sucking noises from their lips and tongues were erotic, as Gon was starting to lose the feeling in his legs. Killua finally pulled out, leaving Gon unfulfilled since neither of them came.
"Why'd you stop?" Gon said in a panting voice, trying to catch his breath
"I want to switch positions." Killua said "I want you to ride me."
Gons eyes blinked twice at Killua's request, or order.. He wasn't sure. But either way he was just scared that he was going to mess it up some how.
Killua got off of him and laid back on the backboard, telling Gon to crawl over.
Gon did as he was told, and hovered over him.
"Now sit down." Killua said. Gon obeyed.
He slowly sat down onto his dick, and it felt different in this position some how, but he still enjoyed it either way.
Gon let out a moan as he put his hands on Killua's shoulders and started to ride him.
His hips moved back and forth along with occasionally bouncing up and down. It wasn't long until the moaning started up again, and Killua enjoyed every bit of it. Gon had his hands on Killua's shoulders, it helped him bounce on his dick easier.
"Fuck.. you're so good~" Killua slurred out as he ran his fingers though the brown eyed boys spiky hair. "I'm.. c-close.." Gon whimpered
Killua trusted up every time Gon brought his ass down, Killua angled himself to where he began hitting Gon's G-spot. Which made Gon go crazy.
"Ah~ Yes!" Gon's moans were louder as he was even closer to cumming now, and soon enough he couldn't hold it in anymore.
He forcefully brought his hips down hard one more time, holding it there with a loud moan of Killua's name as he started to bust. Sputters of cum began to cover Killua's stomach and chest.
Killua's eyes shut tightly, leaning his head forwards he gave out a moan as well as he put his head onto Gon's chest and began to pant even more. Cum filled Gon, every bit of it. Gon was dizzy, slowly picking up his ass as his shaky legs supported him. Cum covered Killua's body and dick, his own dripped from the head of his cock as the rest was all over him from Gon's orgasm. He wanted it this way though, and he was happy he could pleasure Gon this much.
Gon laid next to him, finally catching his breath
"Damn..." Killua breathed out, leaning his head onto him "Maybe we can do the same thing in the morning if you're up to iiiit~"
Gon giggled "Don't push your luck."
He placed his head back onto the pillow as well, closing his eyes. He placed a hand on Killua's head, rubbing his temple.
It was midnight by now, their affair lasted about two hours or so, and they were completely exhausted.
Soft breath was felt on Gon's neck as Killua went to sleep. Gon decided to do the same. Both more than happy they were able to lose their virginity on eachother.————————————————————————
Hi!! I don't know if any of you will see this, but I take requests! So request anything you'd like to see Gon and Killua related and ill more than likely write about it :) (with credit ofc!!)

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Gon x Killua One Shots
Romancethese 2 make me cry. These are one shots I like to do for fun so I've finally decided to start publishing them on Wattpad. Also, I'm not sure of a creative title of this yet!