Work Text:
“Hold still Kacchan.” The words were practically mumbled into Katsuki’s bare skin with how close his face was. Izuku placed his arm across the broad expanse of the other’s back, trying to keep the moving to a minimum as he worked at pulling the black marker across smooth skin.
“I’m not even moving!” Katsuki huffed into the sheets, his voice slightly distorted from his position on the bed, face down with his arms at his sides. The added weight of Izuku sitting on his legs and the arm across the top of his shoulders left little room to get a full breath in, let alone allow him to wiggle around.
“Yes, you are! I can tell,” Izuku quickly sat up and vaguely gestured his hand around the shoulder that he’d just had a marker pressed against,”because that is not how a scapula should look.”
A short scoff escaped Katsuki’s mouth before he could stop it, “Maybe you’re just shit at drawing scapulas!” He pushed up onto his elbows and turned his head as far back as he could, one eyebrow cocked, with a slight smirk pulling at his lips.
There might have been a pout on Izuku’s face, but it vanished the moment Katsuki’s eyes locked with his; when Katsuki smiled, no matter how little or devilish it may be, there was no stopping the mirroring effect it had on Izuku, and his face would blossom into a wide toothy grin. Even when he tried to fight it, like he was trying to now, the corners of his lips would still quirk upwards and his composure would quickly dissolve.
“There’s a reason I’m going to med school and not art school Kacchan! You’re not allowed to make fun of me.” Izuku retorted matter-of-factly. “Besides I’m almost done, and then you can move as much as you want while you help me study.”
“I thought this was helping you study.” Katsuki relents as he slowly lowers himself back onto the bed, pillowing his head on his arms.
“Partly, yes, but after I’ll need to go through and name all the muscles, along with their origins and insertions.”
“I don’t know why you have to draw all the bones out on me, I took this course and I didn’t have to do shit!”
“Yes well, we all can’t be as amazing as you Kacchan,” honey dripped from Izuku’s lips as he spoke praise against the shell of Katsuki’s ear, “plus that makes you the perfect study partner!”
“You owe me big time for this, Nerd!”
“Of course I do babe,” Izuku spoke quickly and placed a small peck on the cheek opposite the one resting on Katsuki’s arms, “now let me finish.”
___
It took a little longer for Izuku to finish drawing out all the bones on Katsuki’s skin, but when he was done he was able to sit back and marvel at the view of his boyfriend quietly sleeping; lulled into slumber by Izuku’s quiet mumblings of bones and muscle attachments, to anyone else it would not have been quite the same lullaby that it was to Katsuki.
In all honesty, Izuku probably could’ve gotten his work done faster if he hadn’t stopped every so often to admire the planes of Katsuki's back or the slope of his neck, or listen to the soft sounds that he made when he slept. When given the opportunity, it was hard not to trace the existing lines of muscle with his fingers as he mumbled their names, or trace the lines he’d been allowed to leave across the canvas of Katsuki’s skin. But when your boyfriend is laid out before you, prepared to be the perfect study guide, anyone would agree with Izuku that focusing can be a very difficult task.
“You done yet Deku?” Katsuki’s voice is barely above a whisper, spoken as if any louder sound would break the spell he’s put Izuku under.
“Yeah,” Izuku slowly moves to lay himself on his side beside Katsuki, “sorry for waking you.” He whispers back.
Neither feel the need to break the quiet that surrounds them, “It was pretty relaxing, but I wasn’t asleep.” Katsuki does however eliminate the space between himself and Izuku by untangling one arm from beneath his head and wrapping it around the other’s waist to pull him close.
Izuku doesn’t respond, he doesn’t need to apologize for the constant mumbling Katsuki had to listen to. The two continue to lay in their embrace, the hushed words and soft touch lulling him into a sleepy haze as he nuzzles into Katsuki’s neck.
A few moments later, Katsuki breaks the silence, “Coracobrachialis.”
“What?” Izuku pulls away from the warmth of Katsuki’s body just enough to see his face; his eyes are still closed, and there’s no hint of a joke anywhere across his face.
“You heard me,” he responds, “Coracobrachialis. Origin and Insertion.”
Izuku stares dumbly at Katsuki for a moment, thankful that he kept his eyes closed, but eventually collects his composure to give an answer to what has been demanded of him.
“The origin is the coracoid process of the scapula,” Izuku shifts slightly to press his lips softly to the top of Katsuki’s shoulder, “and the insertion is on the medial shaft of the humerus.” Again he shifts until his lips are pressed against his bicep.
“Sternocleidomastoid.”
“Origin, manubrium and clavicle. Insertion, mastoid and temporal.” Again, Izuku marked his answers with soft kisses along Katsuki’s collar bone, ending just behind his ear.
The delicate press of lips behind his ear caused Katsuki’s breath to catch, making his next request just a little breathless, “Orbicularis oris.”
Izuku was quickly pulled out of his reverie, “Um… Kacchan I don’t think we have to kno-”
He was cut off by a firm press of lips against his own, and released far too quickly for Izuku’s liking, “Well now you do.” Another quick peck and Katsuki was resituating himself to sleep, and pulling Izuku along with him, “Sleep nerd, you can study more after.”
Agreeing to sleep wasn’t too tough of a decision, and eventually the mass amounts of bone terminology and muscle anatomy drifted to the back of his mind, allowing him to drift off to sleep; a steady warmth surrounding him, from the body that lay wrapped around his and the afternoon sun shining through his window.