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Kirishima and Bakugo have been together since late second year of UA.
They'd been together nearly ten years. So imagine the red heads surprise to learning something new about the blonde. Kirishima practically knew Bakugo in and out at this point. He'd seen him break down, seen him soft and weak, seen him afraid, seen him be brave, seen him fight for his life, anything you can imagine, Kirishima has seen it. And that includes anything sexual. Now neither he nor blonde were into anything too crazy but they did enjoy to experiment. And because of that Kirishima could confidently say that he knew how to make the blonde tick. So you could assume that in this moment, Kirishima was purely stunned.
The two hero's had been on patrol together when they ran into a group of reporters. Being the kind and brave hero he was, Kirishima proudly stepped forward and answered questions for a moment. Bakugo had stayed partially hidden behind him, not wanting to deal with reporters at the moment. And honestly Kirishima didn't blame him. And the red head was doing a good job of answering questions and keep in pace with the reporters. That was until one spoke directly to Bakugo.
"Pro hero DynaMight! Is it true that you and pro hero Uravity are secretly together?!" Kirishima stopped answering a question mid-sentance. His gaze moved down to the wedding band on his ring finger. Then it moved over to Bakugo's face. The blonde had an 'are you fucking stupid' look on his face. Kirishima's gaze flicked between Bakugo and his ring before he plastered a smile on his face and turned to the reporter. However he didn't get a chance to say a word as-
"Why the fuck would I date cheeks?" Kirishima's mouth snapped shut.
'Oh no.'
"Many citizens have reported seeing you two together off duty. Are you saying that you two aren't together?" Kirishima turned to stop Bakugo from answering but the blonde paid him no mind.
"We are definitely not. We are both in our own happy relationships. I thought this was common knowledge." Kirishima gently pulled on Bakugo's arm as he tried to walk them away from the group of reporters.
"If not Uravity, then who is your mystery girlfriend?" Kirishima pulled at the blonde harder.
"Girlfriend?! Are you all fucking idiots?! Isn't it common knowledge that I like di-" Kirishima gave up on trying to pull the blonde away. Rather he whipped around, covering Bakugo's mouth with his hand. Wrapping an arm around his waist and lifting him off the ground. Bakugo continued to shout incoherent words into Kirishima's palm as the red head apologized over his shoulder and walked them away. Once the two were around a corner and out of hearing and seeing distance, Kirishima released the blonde. Bakugo didn't miss a beat, whipping around and pointing over Kirishima's shoulder.
"Pink cheeks?! They think I would fuck- they honestly think that I would stick my dick in Ochaco?!" Kirishima sighed as Bakugo continued to rant. Eventually he cut the blond off.
"It's not any worse than what you were just going to announce to the world." Bakugo stared at Kirishima wide eyed.
"Oh. So you'd rather they think I'm fucking cheeks? What, you ashamed to be seen with someone who likes it up the ass?" Kirishima groaned into his hands.
"Katsuki. That's not what I meant and you know it." Kirishima looked at Bakugo to see the blonde with his arms crossed. Bakugo rolled his eyes as he spoke again.
"KaTsUkI tHaTs NoT wHaT i MeAnT." Kirishima felt his eye twitch at the poor attempt to mimic him.
"Katsuki, don't be a brat." Bakugo smirked and turned to walk away.
"Oh! I'm so scared! Whatcha gonna do Eijirou? Spank me?" and as Kirishima watched Bakugo practically skip away, he felt a light bulb go off in his head. The red head caught up to Bakugo in two long strides. Kirishima pulled his hand back and swung it down on the blondes ass fast and hard. And as a loud smack echoed out between them. Kirishima noticed another sound accompanying it. Bakugo had let out a loud, shocked moan. Both hero's froze. Kirishima came to stand next to the blonde. Bakugo had his arms crossed, a deep red flush covering his cheeks. He was shaking slightly. Kirishima lifted an eyebrow as a small smirk came across his face.
"Do you want to explore that when we get home or?"
"God, yes please!" Kirishima's smirk widens as he begins to walk forward again. Eventually out of the corner of his eye he sees that Bakugo had followed. And as they walked Kirishima couldn't help but feel almost giddy. Cause they haven't tried anything new since high school.
This should be fun.
---
As soon as the two hero's made it home, Kirishima was on Bakugo. The red head pulled the blonde into a heated kiss. Bakugo wrapped his arms around Kirishima's neck and moaned into it. As Kirishima led the two to their room he made quick work to get the blonde down to his underwear. Once Bakugo was down to his boxers and the two made it to their bedroom safely. Kirishima pushed the blond onto their bed. Bakugo landed with a soft grunt, he glanced up and happily watched Kirishima begin to remove his clothes. While the red head moved to grab the lube from their nightstand Bakugo quickly removed his boxers.
When Kirishima turned back around he found the blonde stroking himself at a leisurely pace. Kirishima stood between the blondes legs and simply watched him for a moment. Under the intense gaze, Bakugo moved his hand faster. Moans and whines falling from his lips. Kirishima leaned down and kissed Bakugo deeply. The blonde pulled the red head closer by the hair as his hand continued to speed up. At some point Bakugo stopped kissing back and was simply moaning into Kirishima's mouth. The red head watched as his eyes rolled and a loud moan began to escape him. Kirishima quickly yanked Bakugo's hand away. His moan was cut off by a loud whine as his hips thrusted up into nothing.
"You-hnng fucking asshole." Bakugo gasped as he was flipped over. Kirishima gripping his hips and pulled them up.
"Sue me for preferring to see you cum on my cock." Bakugo moaned as he felt a slick finger press against his hole. Kirishima circled the hole for a moment before pushing in gently. Keeping Bakugo's hip still with his other hand while thrusting his finger in and out. Kirishima made quick work to stretch the blonde. Soon pushing three fingers in and out of Bakugo's hole while the blonde gripped at the sheets and whined loudly. Kirishima made a point to avoid Bakugo's prostate and it was driving him crazy.
"Please- Ei! Please! Fuck just- please!" Kirishima chuckled darkly, thrusting his fingers in deeply, making a point to avoid that one spot.
"What Katsuki? Use your words and maybe I'll give you what you want." Bakugo whimpered. Kirishima pumped his fingers faster. Once Bakugo felt Kirishima avoid his prostate again he snapped.
"Fuck me! Please Eijirou! Fuck me." his words ended in a long whine. Kirishima simply rubbed Bakugo's hip as he pulled his fingers free. Bakugo was left panting and whining against the sheets for a moment before he felt Kirishima's tip rub against his rim. The blonde pushed his hips back gently. The red head groaned as he followed his movement and slowly pushed in. Bakugo let out a low and satisfied moan once Kirishima finally bottomed out. Kirishima stared down at the blondes slightly shaking figure before pulling a hand back from his hip. Bakugo felt Kirishima hold him still with one hand while his hips pulled back slowly.
Suddenly, Kirishima was ramming back into him. Bakugo let out a loud moan as the red heads tip slammed into his prostate. His voice cracked as not even a second later, Kirishima's hand came down and smacked his ass hard. Kirishima groaned at the feeling of Bakugo tightening around him even more. Kirishima began to thrust at a quick and deep pace. Bakugo felt himself holding onto the sheets for dear life as the red heads pace never let up. And on top of that, every few thrusts Kirishima's hand would smack against one of Bakugo's cheeks. The mixture of the two sensations sent him into overdrive.
The blonde could tell he was way to close to cumming way to soon. But he just couldn't handle Kirishima's relentless pace plus the harsh smacks to his ass. He told Kirishima as much.
"Ei- fuck-fuckfuckfuck- I cant- I'm gonna-hnng!" Bakugo felt Kirishima slam into him harder. His back arched and his eyes rolled as his prostate was thoroughly abused.
"Go on, cum for me baby." Kirishima's hand landed against Bakugo's ass once again. In that moment white painted against the blondes eyelids. His thighs shook as his legs finally gave out. He slumped against the sheets with a pathetic whimper as cum shot across his stomach and down onto their sheets. Kirishima was quick to follow him, letting out a curse of his name before he was burying his head in his shoulder. His hips came to a slow stop as thick ropes of cum filled the blondes ass.
Kirishima gently pulled out after a moment. Moving to grab a washcloth from their bathroom. Once they were both cleaned up he curled into the blondes side. Bakugo felt himself start to drift off, but before sleep can take him, Kirishima speaks.
"So... when were you gonna tell me that you liked being spanked?" Bakugo let the question bounce around his head for a moment before he answered.
"I wasn't. But if you're curious, I found out that I liked it after Pikachu jokenly slapped my ass that one time in training." Kirishima sat up quickly with wide eyes.
"Beginning of second year?! You've known since before we were dating and never told me?!" Bakugo shrugged.
"Never came up. Besides, you never asked." Kirishima gaped at the blonde for a moment before a thought seemed to puzzle him.
"Wait, does that mean you liked Denki smacking your ass-"
Bakugo blasted Kirishima in the face.