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Their lips connected tenderly at first.
Eijiro smiles into the kiss as a strong, determined hand grips the fabric of his shirt to pull him closer. He laughs against soft lips, only to grunt softly in surprise when Katsuki presses their lips firmly together again, this time sliding his tongue beyond the threshold of their lips to run the tip of it along the back of his sharp teeth.
He leans forward, hands coming up to cup the blond's face tentatively as they press even closer. He wants nothing more than to merge with this beautiful man in front of him. To crawl under his skin and live there.
A loud bang startles him, his teeth instinctively drawing together, only to part against upon meeting something soft and squishy. A rough yelp. The metallic taste of blood. A sharp kick to his chest pushes him back. An ache blossoming along the area of contact. Not hard enough to send him flying but enough to create distance.
Katsuki's hand flies up to cover his mouth, his nose wrinkling and eyes screwing shut with a pained expression. He winces, cracking open his eyes to stare back at Eijiro, whose eyes are as wide as saucers as the realisation sets in.
He bit his tongue. He hurt him.
Blood drips down onto the cotton white of Katsuki's t-shirt, staining it with the evidence of what had just happened.
The source of the sound pipes up from beyond Katsuki's door.
"Yo! Kirishima! Bakugo! I know you two are studying but we're gonna watch a movie, wanna join?" Sero sounds as happy as ever, blissfully unaware of what he just caused by knocking on the door as hard as he did. It's not his fault, but he feels a spark of irritation nonetheless.
Eijiro realises Katsuki probably can't answer him with a bleeding tongue. Tears prick his eyes as guilt washes over him. Irritation forgotten in this new emotion. "We're gonna be here a while, man! Sorry!"
Sero calls back but he doesn't listen this time, feeling the pressure of Katsuki's foot fall away from his chest. His heel hits the floor with a gentle thud.
This allows Eijiro to close the distance, hands hovering around the front of his face in a panic.
"I'm so fucking sorry! Here, man, let me see..." He gently brushes away Katsuki's hand, not realising how pliant the blond was when he did so. His hand finds his cheek and his other pulls his chin down, thumb moving inwards to grab the top of his bottom teeth and pull Katsuki's jaw down.
Katsuki bats his hands away before he gets to see anything, snapping his jaw shut again. There is blood dripping down his chin, now smeared slightly across his face. The contrast of the deep red against pale skin would be beautiful in any other situation.
"Fck, 'ere." The blond says, but it comes out in a slurred pattern.
Katsuki opens his mouth and sticks his tongue out. Eijiro can clearly see the indents where he teeth sank into the flesh of his tongue. The tears in his eyes spilling over the waterline as he looks at it.
"Shit! Shit, I'm sorry. Let me--" He's about to fetch Katsuki some water, but the same hand from earlier bunches up the front of his shirt and drags him forwards again. Eijiro yelps before those lips find his once more. At first he tries to pull away, but his boyfriend is anything if not persistent.
He forces his way past his lips by biting the bottom of his lip hard, then coaxes his tongue out and gently bites his tongue back. The kiss is messy and bloody. Irony taste and additional wet texture overwhelming his tastebuds. Katsuki's teeth lift for a second before clamping right back down just hard enough to make him yelp and draw back.
His tongue isn't bleeding. He knows that. Katsuki grins through the blood, the white of his incisors peering through at him. His words still slurring. "Don' fuckn' w'ry ab't it."
Eijiro focuses on the stinging on his tongue, feeling warm hands find his face and swipe roughly under his eyes. His tears pushed away. "C'mere."
He hesitates, scanning over Katsuki's face with worried eyes. Surely he's upset? Eijiro just bit him! He'd have every right to be.
He grimaces.
Katsuki rolls his eyes so hard that Eijiro wonders what hurts more. His bleeding tongue? Or his eyes? "F'r fck's sake, 'm fine!"
This time he leans forward as instructed, connecting their lips again to continue right where they left off. Mouths open and tongues press together. Katsuki presses forward aggressively, teeth clicking together as the blond so quickly takes the lead and starts licking against his teeth again with no hesitation.
Eijiro had always worried about his sharp teeth when kissing people. In middle school he'd flat out refused to kiss people. Now, he'd actually had that fear realised. He'd hurt someone and they were bleeding.
And yet... they don't care. They're not worried about it happening again. They're not even bothered by their own blood mixing with their shared saliva.
And he found his worries subsiding, because this was Katsuki. His overly aggressive, loud, obnoxious and extremely determined boyfriend. This was the one man he knew that could be knocked on his ass over a hundred times. Then still get up to shout bloody murder and do it all over again until he got it right. This was the manliest person he knew.
This was the man that loved every part of him. Including those sharp teeth that could cause so much carnage with just one slip.
Especially my teeth, he thinks, judging by the way Katsuki traces the outline of each tooth with the tip of his tongue.
They break apart for air and Katsuki laughs breathlessly against his lips. This time, speaking properly as he wipes the blood off his face using the back of his wrist, a smirk still toying with his features. There's an almost dangerous glint in his eyes. "I love the shit out of you, Ei."
Eijiro snorts, an ugly sound, trying not to burst into a fit of giggles at how absurd this is. "I love you too, Kats."