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Katsuki was stupid, so, so stupid. He’ll admit he shouldn’t have rushed to pursue the villain by himself without a clear plan, which ended up with himself getting injured. If he didn’t he wouldn’t have been in this situation, and Eijirou wouldn't be disappointed in him right now.
When Eijirou picked him up from the hospital, they hadn’t spoken a word. Not a single word was uttered between them. Katsuki rubbed his injured side with a shameful expression on his face, his lips twitching and eyes downcast. He knew he fucked up and he would have repay with punishment from Eijirou.
That’s where Katsuki finds himself later, naked and positioned on their bed face down with his ass up. Katsuki’s legs were held open by a bar tied to his ankles, his body folded to bind his hands to the spreader bar. If that wasn’t degrading enough, Katsuki was suckling on a giant cock gag which was an actual mold of his boyfriends dick, saliva and spit dripped onto the sheets as Katsuki breathed. His eyes undoubtedly dripping tears under the blindfold wrapped around his eyes and head, tears caused by the overstimulation of the fat vibrating plug nestled deep in his hole. The tip of the plug buzzing against his sensitive prostate. Katsuki whined and writhed straining his neck as he twisted his head into the pillow underneath him. Katsuki’s tiny weeping cock strained against his belly. The door to the bedroom opened, alerting Katsuki of Eijirou’s presence.
“Do you think you learned your lesson yet?” Eijirou asked as he neared the bed
“Mmhhh nghh~” unable to talk, Katsuki could only let out wet whimpers and whines, nodding his head frantically. Katsuki could feel the dip in the mattress as Eijirou joined him on the bed, kneeling behind Katsuki.
“No, Katsuki, I don’t think you actually did.” Eijirou sighed, “Maybe this will help you learn your lesson.” Eijirou reached his hand up and brought it down hard on Katsuki’s plump ass cheek. A muffled scream erupted from Katsuki’s parted lips. Eijirou struck down again on his reddening ass cheek. Only two hits and Katsuki is already trembling and panting. The third hit comes but instead of landing on his ass cheek like Katsuki was expecting, it connects with his sensitive balls. That last hit brought Katsuki over the edge suddenly as he came all over his stomach and the sheets below.
“MPHMM” Desperate sobs are muffled behind the cock in his mouth. Katsukis body, which was jolted forward from the assault on his poor balls, is pulled back into place by two strong hands on his hips. Eijirou chuckled as he cradled Katsukis poor stinging balls and soothed them with his hand. Katsuki stiffened as his moans grew in volume, overstimulation catching up with him from the plug pressed against his prostate which persistently buzzed, and the stimulation on his balls.
“Shhh Katsuki, you're being such a good boy for me.” Eijirou cooed as he turned off the vibrations and gently pulled the plug out of his twitching hole. He watched as a little bit of lube cascaded down his boyfriends taint from his gaping hole, dripping down to his now swollen balls. Eijirou was quick to fill up his boyfriends little hole with his thick cock. Still loose from the plug, Katsuki's hole was easily sucking in Eijirou. Katsuki’s back arched at the intrusion, soft whines escaping his throat. Eijirou’s cock was definitely bigger than the plug that previously stuffed his needy hole. The stretch of his hole was enough to have Katsukis miniature penis filling up once more. Even hard, his little dick didn’t surpass two and a half inches. Definitely the pro-hero’s deepest secret, it took months into dating to even show Eijirou his dick because of his embarrassment.
Little pops fizzle from Katsukis bound hands,
“Good boy Katsuki, let it out baby, I know you learned your lesson by now.” More pops sound out in the room, “I'm gonna start moving okay, baby.” A weak nod in response is all Eijirou needs to start his ruthless pace into the blond. More small pops are released from Katsukis sweaty palms. Eijirou peers down to the sight of his cock being swallowed in by the spasming hole. The tight grip on Katsuki’s hips, undoubtedly bruising. Eijirou reached down to unbuckle the gag and gently pulled out the fake cock from Katsuki’s lips. Once muffled cries became apparent as Katsuki wailed loudly from the rough thrusting of Eijirou into him.
“I'm sorry! I'm sorry! Please Ei! I’m-I’mm Sorr-rry!” Slurred out from wet lips
“Shhhh, I know baby, I know.”
“Immm! Imm… Hahh, Hahh. Ngnn! Im!” Katsuki wailed out before he came uselessly against his belly for the second time that night. Eijirou nearing his climax only sped up his thrusts until he came inside Katsuki’s greedy hole.
Both of them panted roughly still connected. Katsuki shivered and his body sagged as Eijirou slowly pulled out, his hole clenching to keep all of Eijirou’s cum inside. Eijirou reached for the bedside table for a smaller metal plug that Katsuki likes to sleep with. This plug in particular was Katsuki’s favorite plug because of the engraved ‘R’ at the base. Only a drop of Eijirou’s seed escaped from his hole, so Eijirou scooped it up with the cold tip of the plug and inserted it inside of Katsuki’s heat. Katsuki’s hands and ankles were untied as his limp body slumped into a heap on the bed. His tear soaked blindfold was also removed uncovering his full fucked out expression.
“Let's get you cleaned up baby, Okay?” Eijirou only received a whine in response, “Just wait here Kats, let me go fill the tub.”
As the tub was filling up with hot water, Eijirou gently picked up his baby, his hands going under Katsukis thick thighs. Katsukis head nuzzled into Eijirou’s neck as they neared the tub. Eijirou stepped inside the tub, submerging them both in the warm water, and Katsuki was rearranged to sit with his back to Eijirou’s chest. Katsuki’s eyes were lidded and cloudy as he leaned his head back into Eijirou’s collar bone, low whines emitting from closed lips. The rest of the night was spent on Eijirou lathering soap on to Katsuki’s pale skin and gingerly scrubbing the nitroglycerin off of his palms and hands. After their bath, Eijirou carried his baby back to bed seeing as Katsuki was still too out of it to get up on his own. Eijirou carefully tucked Katsuki into his chest as they eventually both fell asleep.