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Perfect fit

Summary:

There was one other small caveat that stressed Dennis out when he thought about sleeping with Robby.

Dennis was… below average.

Noticeably so.

OR

Dennis has a small dick. Robby has hyperspermia. Neither of them mind. In fact, they both enjoy themselves very much. This is pure smut.

Notes:

I did a poll on twitter/x (@boywondqr) to celebrate hitting 1k followers and the people spoke and this was what they chose!! I had a lot of fun with the prompt and I hope y'all enjoy, this is all horny filth.

(See the end of the work for more notes.)

Work Text:

Thirty-eight days.

That was precisely how long Dennis and Robby had been seeing each other for. 

Thirty-eight days of Robby’s steady body next to him on the couch, of his gentle teasing, and of his heavy kisses that made Dennis feel like he was starved for something only Robby could give him. 

Despite that, it had also been thirty-eight days without actually having sex.

It wasn’t for lack of trying, the two of them had simply been the victims of a string of very bad luck and inconveniences.

On their third date, Robby invited Dennis over to ‘watch a movie’, and Dennis managed to control himself until about the halfway point, when he crawled into Robby’s lap and started kissing him. 

It was great. Robby ran his hands up his thighs and they made out like teenagers. 

Right as Dennis had managed to pull away for long enough to yank his shirt over his head, Robby’s phone rang. 

Robby cursed under his breath and said, “That’s Jack. He wouldn’t be calling if it wasn’t important. Sorry.” 

Dennis awkwardly slid off of his lap as Robby grabbed and picked up his phone. 

Dennis couldn’t hear what Abbot was saying on the other end, but Robby’s forehead creased and his lips turned down into a tense frown. 

He let out a long sigh and said, “Fuck. Okay. I’ll be there as soon as I can.” He shot Dennis an apologetic look and said, “There was a boat crash with a huge wedding party on it. They’ve got propeller injuries, water injuries, everything, coming in the next ten minutes and Ellis is already out of town this week.”

Dennis stared at him for a moment, before he realized Robby was asking him something. “Oh-oh! Yeah, no. Please, go. They need you there.”

Robby got up and started grabbing at his bag and shoes. “I’m sorry. You can stay here if you want and hopefully I won’t be back too late and we can… finish the movie?”

“Sure.”

Dennis waited and waited, but clearly the ER was a mess because Robby didn’t come home for a while. By the time he did, Dennis had already fallen asleep.

It was fine. Honestly, Dennis was fully aware of the responsibilities of Robby’s job and it didn't deter him.

A week later, Dennis was pressed against Robby’s front door as he grabbed his ass and bit his lip. 

Dennis moaned against Robby’s mouth and said, “Mph, Robby…”

And then Dennis’ phone blasted “Don’t Stop Til You Get Enough.”

They jumped apart and Dennis fumbled for his phone. He saw Trinity’s contact info on the screen and he hit accept. 

He said, still slightly out of breath, “Trin? Are you okay?”

Her voice was cold and sharp- a stark contrast to the gooey warmth he was feeling a moment ago. “Dude. Where are you?”

“Where… huh?” 

“I’m at the airport. Waiting for you.

Dennis gasped. “Oh my god.”

He thought Trinity was flying back tomorrow. He must have gotten the days mixed up. Fuck fuck fuck. He was supposed to pick her up. 

Trinity said, “Did you seriously forget?” 

He put a hand between him and Robby, giving himself space and said into the phone, “I am so so sorry, I’m driving over right now.” 

Robby shot him a confused look. 

“Such a huckleberry. Just hurry up, will you?” And then she hung up. 

He felt like a total idiot. Dennis winced and said, “We’re going to have to raincheck- I’m sorry, I totally messed up and forgot I was supposed to pick up Trinity from the airport today.”

Robby frowned and asked, “When?”

Dennis checked his watch. “Ten minutes ago?” He pulled out Trinity’s car keys from his pocket, which he’d been borrowing for the week while she was gone and said, “I’ll make it up to you, I promise! Bye.” 

He gave Robby one last quick kiss and hurried out. 

Stuff like that kept happening. It seemed like every time they tried to take a real beat to enjoy each other, some other problem popped up. 

Dennis didn’t want their first time together to be a clumsy handjob in the bathroom, he wanted to take his time with Robby, but it was difficult to find said time. 

So, once they passed the one month mark and they still hadn't gone further than some heavy petting, Dennis took it upon himself to plan it out properly. 

He chose a date and triple-checked that they were both going to be free. He told Trinity not to call him unless somebody was actively dying. He casually mentioned to Abbot that Robby was going to be busy and to please, please, please not bother him. He packed condoms and lube in his bag. 

Nothing was going to stop him. 

The second Robby closed the front door behind them, Dennis grabbed him by his collar and pulled him into a needy kiss. 

Robby smiled and said, “Aren’t you eager.”

He sighed wistfully. “Very.”

Robby matched his enthusiasm tenfold. He shoved Dennis up against the wall and pressed his tongue inside his mouth. He kissed him like he wanted to take a bite out of him- and Dennis loved it. 

He was glad to see the growing anticipation had made Robby just as desperate. 

His hand trailed down to Dennis’ ass, and he squeezed. Dennis blushed and moaned, “Yeah, fuck, please keep touching me.” 

Between kisses and bitten lips, Robby pressed his leg in between Dennis’ thighs, giving him something sturdy to rub against. 

The pressure was delicious and Dennis happily rubbed his still-clothed cock against Robby’s pant leg. 

Robby suddenly leaned back, glanced down between them, and said, “Is this okay? Do you want to stop?”

Dennis blinked. “What? No, I don’t want to stop. What do you mean?”

He was briefly distracted staring at Robby’s red and spit-shiny lips. I did that. 

He forced himself to tune back into Robby’s words. “I just wasn’t sure if you were enjoying it- you’re not hard.”

Dennis froze.

He threw his head back and groaned in embarrassment. He covered his face with his hands and screwed his eyes shut, like if he didn’t see Robby, then the humiliation would disappear. 

Robby’s eyes went wide and his tone softened. “I’m sorry, did I say something wrong?”

Dennis shook his head and said, through tight, gritted teeth, “No, it’s just, um. Well. I am hard?”

There was one other small caveat that stressed Dennis out when he thought about sleeping with Robby. 

Dennis was… below average.

Noticeably so. 

He had vivid memories of being teased in the boys locker room. It was a childish thing to be insecure about, but it was hard not to be when he already felt like less of a man compared to his older brothers and any other male friends he had made. 

It was just another nail in the coffin of his dwindling masculinity. 

He really really hoped that Robby just wouldn’t mention it, which was a dumb assumption to make. It felt like the wind had been pulled right out of his sails. 

Robby didn’t laugh, he just said, “Oh.” 

Dennis ripped the bandaid off and said, “I’m kind of on the smaller end, so it's not super noticeable with my clothes on. Sorry.” 

The fear creeped in that Robby might be so put off he won’t want to be with him anymore, but Robby quickly said, “Don’t be sorry. I like that.” 

Dennis rolled his eyes. “I appreciate you trying to make me feel better, but you don’t have to lie.”

“I’m not lying.” Robby didn’t break eye contact as he untied his scrub pants and stuck his hand down the front of Dennis’ boxers.

Dennis inhaled sharply. Robby’s warm hand wrapped around his cock. He easily covered the width of it with his hand. Robby leaned close, so their lips just barely brushed, and said, “See? It’s a perfect fit.”

Dennis looked away. He knew his face was probably bright red with a mix of want and embarrassment, but Robby wasn’t deterred. 

The older man got down on his knees and tugged Dennis’ pants and boxers down to free his hard, leaking cock. 

There was something so deeply overwhelming about seeing Robby down on his knees, staring up at him. 

Robby pet his thigh soothingly and said, “Relax, baby, I’ve got you.” 

He added, "I'm just glad I don't have to hurt my jaw. So much easier." Before Dennis could even respond, Robby swallowed his entire cock down. 

Dennis whimpered, “Holy shit.” 

Robby took his cock all the way into his mouth, until his nose was pressed against Dennis’ light brown curls. The warmth of his breath, the wetness of his spit gathering and the slide of his tongue around Dennis’ dick all at once was mindmelting. 

Robby’s tongue rubbed against a vein and he hummed while he sucked him off, sending a low vibration through Dennis. 

He felt utterly devoured. 

Robby pulled all the way back, until he was nearly completely off, and suckled on Dennis’ tip, lapping up the precome starting to gather there. 

He popped off and said, “Perfect little mouthful.” 

The compliment sent a rush of heat straight through his spine. 

Robby dove back in, all the way down until Dennis's entire cock was twitching inside of his mouth.

And then Robby swallowed around him and the sensation of it made him jerk his hips forwards. Dennis whined, “Ah god- feels so good.” 

He pulled back barely an inch before bobbing his head and swallowing him back down to the hilt. Robby didn’t seem sore or tired in any way, in fact, he seemed totally content. 

Robby’s gaze landed squarely on Dennis’ face, hovering above him, looking down. 

God, he probably looked so stupid. Face slack and jaw open from a mix of pleasure and shock at seeing Robby of all people, his boss, sucking his dick like he had nowhere else in the world he’d rather be. 

He pulled off again and pressed several, wet, open-mouthed kisses along his length. He mumbled, "Beautiful. I can hardly believe I get to have you all to myself."

Dennis bit back a pleased smile, which dropped into a moan when he felt something poke him from behind. He realized Robby had snaked a hand between his thighs and pressed a spit-slick finger into his ass. 

Oh that’s new.

He’d never been fingered while being sucked off before, and the nonstop pressure on both ends made his head spin. He didn’t know if he wanted to push his hips forward, into Robby’s inviting mouth, or backwards, forcing his blunt finger further inside of him. 

He could see Robby’s cock straining against his jeans and imagined how much bigger it was compared to just his fingers. 

Robby pressed a second finger inside and crooked them forward. Dennis gasped when they brushed against his prostate. 

He took his time opening him up. He pumped his fingers in and out and scissored them, stretching him out. 

Robby rubbed against his prostate at the same time that he pulled his head back and swallowed Dennis down to the hilt in one, smooth movement. 

Dennis quickly unraveled into a horny mess. “Ah-ah, fuck. Wait, I’m close.” 

Robby didn’t slow down. Instead, he pinned Dennis’ hips against the wall and bobbed his head faster. 

Robby shoved his fingers as deep as they could go inside of Dennis, and that was enough to light the fireworks behind his eyes. 

Dennis came in several long pulses between Robby’s lips. He swallowed it all down and continued to lick at Dennis’ softening cock until the stimulation got to be too much and Dennis guided his head away. 

He only had a few seconds of reprieve before Robby said, “You think you can go again?” His voice was a wreck. 

Dennis nodded and blinked away white spots in his vision. “Ah, mhm. I um, I have a pretty short erm- ref- uh,” Holy shit, use your words. “Refractory period, so.”

“Of course you do. You young people and all your energy.” Robby groaned as he got up and said, “My knees aren’t what they used to be. Come on.” 

Dennis nearly tripped on his way to Robby’s bedroom. He still felt lightheaded from the first orgasm Robby had pulled out of him. 

Dennis sat on the edge of the bed as Robby undressed. He fiddled in place excitedly. The night was already turning out to be far better than he had even hoped. 

He salivated at the sight of Robby’s large cock, unobstructed by any clothing. 

Robby didn’t give him much time to appreciate it, before sat down next to Dennis, put his hands around his waist, and pulled Dennis up to sit on his lap. 

Robby chuckled and said, “You’re looking at me like I’m a slab of meat.”

Dennis straddled his lap, with his legs on either side of Robby’s and kissed him. “Can you blame me?” He leaned forward and flinched when his soft, sensitive cock pressed against Robby’s.

Dennis looked up at Robby for some sort of guidance or instruction, and Robby slowly rocked him forward, so his dick could rub against Robby’s. 

Oh. 

Dennis got the hint and he sat up on his legs to get a better angle. 

He was quickly getting hard again, despite the short turnaround. Being so close to Robby made it easy. 

He glanced down between their bare chests and whined when he saw his small, throbbing cock touching Robby’s dick. 

The size difference between them was nothing short of obscene. 

Robby noticed too, because he smirked and said, “Don’t get shy with me now.” He tilted his hips up so he could rub his thick cock against Dennis’. He reveled in how easily his length eclipsed Dennis’.

Dennis whimpered, embarrassed, but the feeling of their dicks touching was too good to pass up. Dennis’ was already slick from the blowjob Robby gave him, and with each drag of skin on skin, their tips gathered precome and slid against each other easily. 

Robby grabbed him by his ass and yanked him closer. “Come on, rub your cute little cock on mine, baby.”

The condescending compliment burned through Dennis’ blood and only made him more desperate. 

“D-don’t make fun of me…” Dennis couldn’t take his eyes off of the collision of their dicks together. 

Robby leaned his hips back and a long string of precome and saliva connected their shafts. His voice was low with lust, “I’m not making fun. Promise. Fuck, Den, you're gorgeous.” He thrusted his hips up and kept rutting the two of them together.

“Shit, Robby-” Dennis dropped his head into the crook of Robby’s neck and shoved himself as close to Robby as possible, until their bare skin was pressing completely against each other. He humped the older man’s larger cock and whined. 

“M-mng-ah. Can I-can I come on you, Robby? Fuck, you feel so good.”

Robby moaned and said, “Ah- fuck, It’s okay, sweetheart.”

Dennis whimpered against Robby’s shoulder as his dick spasmed and spilled come between the both of them. 

He breathed heavily and let out a long sigh. 

Robby kissed him and said, “I love it when you say my name like that.”

Dennis leaned his head on Robby’s shoulder and paused for a minute, listening to their fluttering heartbeats. 

Robby gently rubbed his back and said, “Are you good to keep going?”

Dennis nodded and shoved their lips together, “Mhm. Please.” As spent as he was, there was no way the night would be ending without Dennis getting Robby’s dick inside of him. “I uh, I have stuff in my bag if you don’t.”

“I think I’ve got everything, but thank you.” He nibbled on the soft skin of Dennis’ throat and mumbled, “You like to be prepared, huh?”

Dennis said, honestly, “For you? Yes.” 

They moved so Dennis sat on the bed and watched Robby pull open his bedside drawer and take out condoms and a small bottle of lube. 

He had brought condoms too, but seeing Robby’s cock only heightened his desire to feel it inside of him, raw and bare. Dennis said, “I’m um, I’m clean.”

Robby paused just long enough for doubt to creep in.

He quickly added, “Unless you don’t want to, of course, which is totally fine. I won’t be offended at all-”

“No, that’s not- I’m also clean. I got tested a few months ago and I haven’t been with anyone since.” 

He knew that they were exclusive with each other, but it was still nice to hear confirmation that Robby hadn’t been with anybody else since they’d gotten together. 

Robby’s cheeks darkened and he averted his gaze. “It’s just uh- well. I come a lot?”

“Oh.” He wasn’t expecting that to be an issue. “What do you mean by a lot?”

“More than average?”

“How much more?”

Robby barked out a laugh. “I don’t know, I've never measured it.”

Right. Guess that makes sense.

He continued, “I just wanted to let you know so you’re not surprised. It might get… messy.”

Dennis said, far too eagerly, “I like messy.” 

Robby’s eyes darkened. “Yeah?” He leisurely jerked himself off with one hand and Dennis nearly passed out when he saw he was using Dennis’ come as lubricant. He said, “Lay on your stomach.” 

Dennis swallowed and positioned himself on the bed, with his hips up. Robby had prepped him already and he missed the feeling of his fingers inside of him, but he buzzed with excitement at the thought of finally being fucked properly. 

He heard the sound of the lube cap being popped open and the wet sounds of it against Robby’s skin. “Ready?”

Dennis nodded. “Yes- please.” He wiggled his hips in a way he hoped came off as sexy. 

Based on the low, “Fuck…” that fell out of Robby’s lips, it worked.

Robby placed a hand on Dennis’ waist to hold him steady, and then he pushed inside. 

Dennis knew it would be big, he’d seen it already, but seeing Robby’s cock was nothing compared to feeling it stretch him open and brush against his most sensitive parts. 

He couldn’t do anything except lay there and take every heavy inch. 

Robby rocked forward and his hips met Dennis’ ass with a low groan. 

The dull pleasure pulsed inside of him. He whined against the pillow, “Uh-fuh, Robby please fuck me. I need it so bad.”

He started off slow, rocking forwards and backwards until Dennis got used to the sensation, then he gripped his hips and thrust into him faster. 

Every rough thrust forced out a little “ah-ah-ah” from Dennis’ lips. He gripped at the covers each time Robby hit his prostate again and again. 

He glanced down and saw his own cock was hard again and twitching against the covers. 

Dennis lost track of what he was even saying. It was some string of “pleaseharderyesohgodfuckmeharderharderyesfeelssogood”. He didn’t care. His whole world narrowed down to the smack of Robby’s hips against his ass. 

Each spark of pleasure burst through him and pushed him farther and farther away from any sort of coherent thoughts. 

Robby fucked him hard and relentlessly. He grunted above Dennis as he abused his prostate and sent shivers through his body. Every thrust shoved Dennis forward against the bed covers and the frame squeaked with the movement.

Yes yes yes yes. 

Dennis was in heaven. He let go completely and sank into his body. Every nerve ending was lit up and white-hot. 

And then Robby stopped moving. 

Dennis pouted and said, “m’Robby?” Was he getting tired?

Robby readjusted himself behind Dennis and said, “I’ve got you, sweetheart, don’t worry.” He pulled out, and Dennis bit his lip to stop the pathetic cry that almost slipped out at the emptiness. The bed shifted with the movement and Dennis inhaled sharply as he felt Robby’s stomach press against the curve of his back. 

Robby kissed the back of Dennis’ neck and shoved his cock back in. Dennis let out an embarrassing squeak and kicked his feet involuntarily. He was laying flat on his stomach and the weight of Robby on top of him made it hard to move. 

The new position reached even deeper inside and Dennis quickly started moaning at the blunt pressure teasing the deepest parts of him. 

Robby rolled his hips forward and back, fucking him slower than he was before, but it was just as effective of erasing Dennis’ brain of anything that wasn’t Robby’s name. 

“Uh-uh, fuck, Robby. Ohmygod.” 

Robby moaned, “You feel so good, could fuck you like this forever- shit.” 

Hearing how much of an effect he was having on him and how good he could make Robby feel was so nice. It made him grow warm and fuzzy in his stomach. 

Dennis breathed in in several quick inhales as Robby grinded his hips against his ass. It was all so right. The satisfying stretch and thick length that he could clench around was just enough to scramble whatever was left of Dennis’ head. 

Robby’s thrusts became less even and measured. He pressed his face against Dennis’ back and Dennis felt the rough texture of his beard brush against his skin. “Oh, fuck. I’m gonna come, sweetheart, can you take it?”

Dennis nodded frantically. His tongue felt heavy, but he still managed to say, “Yeah, yeah, inside, oh, inside, I can take it.” 

Dennis whimpered and bit down on the pillow under his face. He felt Robby’s cock twitch and spill hot, thick come inside of him. His legs trembled at the sensation. 

After a second, Dennis thought that was it, but then Robby leaned down on top of him and gave another hard shove and even more come flooded inside. 

Dennis whimpered, “Fuck-m’so full.”

That had to be it. 

Robby growled, sounding just as out of it as Dennis, “Just a little more, baby.”

There’s no fucking way. 

And maybe Dennis was a freak, because apparently, Robby’s words were just enough to push him over the edge and make him come for a third time, this time untouched. His muscles tensed and he came in a few, small spurts on his own stomach. 

He moaned pathetically against the pillow. It was too much. He felt come spilling over around Robby’s cock and down Dennis’ shaking thighs. 

Robby’s dick twitched and let out one last rush of come before he finally pulled out and let it drip out of Dennis’ ass. 

Robby tapped his back softly and said, “Fuck, angel, you took it so well.”

The pet name flustered him. He certainly didn’t feel like an angel. 

The way he was right then, legs spread, hair matted to his face with sweat, asshole twitching and drooling with Robby’s come, he felt like a whore.

He still felt full, too, even though Robby had already pulled out. He mumbled, “Jesus fucking Christ.”

They both breathed heavily for a few seconds before Robby said, “Shit. Sorry. I’ll clean you up.” 

“Is’fine.” Dennis sighed deeply. “Think you might have gotten me pregnant.” 

Robby laughed. “Shut up.” 

He heard Robby get up out of the bed and walk around, but he didn’t bother lifting his head up to watch him. His bones felt like overcooked pasta noodles. “I’m serious- I think we defied some laws of biology there.”

Robby tenderly placed a hand on the back of Dennis’ thigh and cleaned him up with a washcloth. 

He poked Dennis’ arm and said, “Hey, kid, I need you to flip over.”

Dennis shook his head, face still buried in the soft pillow. “Tired.”

Dennis couldn’t see his face, but he could feel the eye roll radiating off of Robby. 

“Come on, give me two seconds, or else you’ll be miserable and sticky in the morning.”

Dennis groaned loudly and dramatically before he flopped over onto his back. “You’re so cruel to me.”

“Yeah, yeah. I’m a real tyrant.” 

Once he finished, he ran his fingers through Dennis’ sweaty curls and leaned down to kiss his forehead. 

Dennis smiled cheekily and said, “What should we name the baby? I’m thinking something classic if it’s a girl, like Beatrice. If it’s a boy-”

Robby grabbed his face and squished his cheeks together- cutting him off. “I’m trying to have a nice moment with you.”

Dennis laughed and yanked him down onto the bed with him. “We just had several nice moments, one after the other, if I’m remembering correctly.”

Robby let out a dramatic sigh as he laid down next to him, but he still pulled Dennis into his arms and kissed his nose. 

Dennis relaxed against his chest. He toyed with Robby's necklace and said, "We should have done this by the second date."

Notes:

Sorry if the endings a bit abrupt, I had trouble figuring out a good way to end it.

Thanks for reading! Comments and kudos are always appreciated <3