Connie could barely wait past the prepping stage. He was too eager to get things going, having waited all day for this already, but he knew he couldn't rush something like this. Reiner was big, really big, which meant that the prep took a lot of their time. So much so, that this was Connie's first time actually taking him. He had always come from the fingering alone, even if Reiner tried his best not to over stimulate him. What could he say. Connie was just really into fingering, it turned out.

"Breathe." Reiner's deep voice echoed through the air, making Connie's skin ripple with bumps. He shivered, struggling to control himself as those four fingers steadily stretched him open. He didn't press or probe at Connie's prostate for a good reason and any thrusting motions would quickly get him off. It was almost like trying to finger a ticking time bomb.

"I'm tr-trying." Connie exhaled unevenly. "It's just so good..."

Connie felt those rock hard abs press against his back and he couldn't hold back the whimper that came from him. Oh, he really loved those. If only he could flip over and kiss them. He already had tonight, but he was eager to try it all again.

No. Focus, Connie! You're going to get dicked down today. You promised both yourself and Reiner that you'd be able to hold it back long enough to get to this last part. What kind of boyfriend would ruin break a promise like that?

He took another steadying breath, thinking of anything besides those fingers or the abs over his back. Or the fact that Reiner could probably see how stretched out he was- no! Nope! Think about something nasty, Connie. Think about Jean's armpit hair or that one time he almost walked in on the Captain shitting. Yep! That did it. He was able to calm down enough to let Reiner breathe over his neck and slowly pull out his fingers.

"There. I'm proud of you for keeping it together. I know how much you love it when I finger you..."

Connie groaned at the emptiness, unable to control how his hips bucked to try and get some friction. "Please, just put it in already!" All of his frustration came rushing in all at once. "I'm too empty..." He let out another desperate whine before Reiner finally grabbed onto his hips, angling him where he wanted.

Then, after a deadly long pause, something brushed his backside and Connie gasped. He turned his head as best he could in this position and nearly came when he saw the thick head of Reiner's cock rubbing against him. It was already covered in lube. All he had to do was put it in.

"Please..." Connie gasped again, wanting nothing more than to feel that thick, veiny-

Connie's mouth fell open as the head pressed against him. It felt impossibly large, almost as if all of that prep was for nothing, but it eventually slid inside after enough pressure and the smaller boy shook with the overwhelming sensation of it.

It was painful. That much was obvious with how Connie's ass burned, the pressure almost unbearable, but he let it continue. He knew it would get better. He had tried fooling around enough on his own for that to be clear. He had shoved many different objects inside of himself just to get used to how it would feel but honestly, nothing could've prepared him for this. Not the countless times he had gotten fingered by Reiner or even the largest cucumber he could find and managed to shove it all the way in. This was just...unreal

"H-ha! H-How?!" Connie managed to get it out between clenched teeth. Reiner was still sliding in inch by inch. Connie had lost all sense in time and measurement, not sure if he was anywhere close to bottoming out. Oh fuck, he hoped so.

Everything stopped as his words slipped out and a large hand slid down his sides. When Reiner spoke, his voice was breathy and rough, almost like he was the one who's ass was getting split into two. "How what?"

"How...are you so big?!"

It wasn't intended to be a joke, but Reiner chuckled anyway. He continued to shift this way and that, making his dick shift as well. It was almost welcome compared to the pressure from before. "I've always assumed it was because I'm half Marleyan. They tend to be...um, bigger. In most areas."

He was half Marleyan? Huh. That actually made a lot of sense, now that Connie was thinking about it. His bold features, sharp jaw line, big boobs. He wasn't obnoxiously tall like Bertholdt was, but he gained muscle where no one else seemed to even have any. He was different in the more subtle ways, but they tended to add up. Especially here.

"Damn." Was Connie's only reply. He would very gladly refuse any offer to sleep with any Marleyan if they were all like this. But he didn't exactly need them anyway. Reiner was more than enough to satisfy his emotional and physical needs.

There was a long pause where no one moved, but finally, Reiner leaned close again. "Should I keep going?"

Connie had to think about it for a moment before finally nodding. "Yeah. Just...maybe go a little slower?"

"We're almost all the way in. I only have, like, three inches."

Oh. Well, then. That was quite an accomplishment. He didn't know how long Reiner was before all this, but he had to be at least seven or eight, right? And he was thick as fuck! "Alright." Connie breathed again and braced for more pain.

Surprisingly, none came again. There was only a little pinch here and there as he pushed the rest of the way in, but honestly, it wasn't bad. Was it that time they spent? Did he adjust that much over a small conversation?

They sat still again and Connie let himself feel full. It honestly was probably really bad for his organs, to be stretched so wide like this, but he knew that if Reiner pulled out, it would all go away and he hated that thought. Finally, after what felt like forever, Reiner started to pull out but pushed back in immediately after. Connie's mouth was open again at the dragging sensation inside of him and he just knelt in shock as he started to feel that familiar pleasure.

"Oh, fuck" Reiner cursed from behind him, a large hand now squeezing his thigh with every thrust in. "You're really tight...it doesn't hurt, right?"

"N-No." Connie swallowed, trying to get the moisture back into his mouth. "No, keep going."

Now encouraged by Connie's confirmation, Reiner started thrusting in fully. Every pull came back faster than the last one and soon, they had established a quicker pace. Sounds started spilling from Connie's open mouth as he struggled to accommodate just how large it was. Oh shit. He was going to get fucked wide open, wasn't he.

"Connie..." Reiner moaned above him, his deep voice rumbling all the way down to his dick and inside of Connie. It made the smaller man's legs shake slightly. "Tell me what you want"

"Harder" He demanded, almost immediately and he got it. Reiner started pulling out all the way to the tip and thrust in harder, the motion pushing Connie forward every time. "Ooooh! Oh!" Connie's breaths came quicker as he felt something inside of him get brushed every so often. It sent shivers through him and his dick was aching for attention. Without thinking, he reached down to pleasure himself but after another harsh thrust, his entire upper body fell onto the bed.

"Fuck! S-Sorry." Despite the apology, Reiner continued to bury himself deep inside of Connie's tight hole. It felt so good and with every crash of pleasure, Connie was whimpering and moaning uncontrollably. This was amazing! Why didn't he ever last long enough for this!

One hand pulled roughly at his cock, making his entire lower body feel nearly numb with pleasure. Every nerve was firing off rapidly. He could barely register the pre-come leaving him and dripping onto the blanket in thick globs. It felt so good. There were no words to describe it. It was the perfect balance between constant overstimulation and needing more. He wanted to live in this moment for the rest of his life, just getting fucked open by Reiner, but he couldn't.

"Oh fuck!" Connie shouted into the sheets, his eyes rolling as Reiner's head pressed directly into his prostate, making him choke in a breath. Reiner groaned above him as Connie's walls spasmed. He was so close. The hot burning inside of his stomach felt closer and closer, nearly tipping him over the edge. "Fuuuck!" Connie practically sang as he increased the pressure of his own cock, giving it a few more quick pumps. He finally let go with another harsh thrust into his prostate.

Everything went white for a moment and Connie was sure his soul had left his body, because all he could feel was the overwhelming pleasure. His body no longer existed and neither did the room he was just in. He couldn't even breathe for a second or two. All he could do was feel.

Then, he came back to earth and whimpered as Reiner thrust into him once, twice, then pulled out to come all over his back. He couldn't care less, to be honest. He was already deadly tired and just slumped over as he panted out. The feeling of something sticky pressing into his stomach didn't bother him as he closed his eyes. The bed dipped beside him and he didn't bother to see that Reiner was now laying to his side, probably smiling like an idiot or something.

"Hey." A gentle hand pulled Connie closer and he went willingly. "You were amazing."

Connie hummed tiredly before mustering up the courage to find a response. "You too. I'll probably want to do that again tomorrow night." Baritone laugh came out from that and it was enough to make him happy. He did feel empty, which made him also kind of cold, but with Reiner on his back, he'd be okay. Reiner was always warm and safe.

"Maybe we should shower before we completely ruin our blankets." Reiner suggested in a tired voice of his own, but Connie could tell that he wouldn't move if Connie didn't. How lazy of him.

"Meh. You have the money for new ones."

Reiner chuckled again and this time, Connie could feel it all through his own chest as well. He really liked that feeling. He could so easily get addicted to it.

Sup! I'm not sure when exactly this takes place, so I guess you can make that up for yourself. I really love this ship and it's very underappreciated. I have more headcanons for these two but I didn't have enough time to really dive deep into them. I also love the idea of Connie trying to find things to masturbate with but just getting things stuck in his ass.