a/n: i love sensei izu and pro hero katsuki sm
there’s a single knock on the classroom door before katsuki is entering. izuku’s eyes widen and the students gasp as they take in katsuki in his hero uniform. izuku stands up from his desk and pushes katsuki out into the hall and clicks the door shut behind them.
“what are you doing here?” izuku hisses, breath catching in his throat as katsuki pushes him back against the wall.
“can’t visit my favorite sensei?” katsuki tugs on izuku’s tie.
“you- you can.” his cheeks heat. “but you should tell me first.”
“why’s that?” katsuki leans down, inching closer.
“kacchan someone could see.” he presses his hands to his chest.
“and what are they gonna say?” katsuki’s mouth centimeters from izuku’s.
“one kiss, then i have to get back to my class.” izuku’s practically panting now.
that’s all it takes for katsuki to be pressing his lips against izuku’s. it’s searing and all consuming. izuku pulls back for a breath but katsuki follows him and captures his lips again, snaking an arm around his waist and pulling him closer.
“kacchan we- mmph!” katsuki kisses down his neck. “we’re in the hallway.” he pants.
“lunch is soon, right?” katsuki chuckles against his warm skin, sucking a small mark just under his collar.
“yes!” izuku’s fingers dig into katsuki’s arms.
“then i’ll wait with you and watch you teach.” katsuki pulls away. “c’mon sensei, before these kids get any weird ideas.” he leaves izuku pressed against the wall while he opens the classroom and walks in.
izuku smooths his shirt and straightens his tie, nodding his head before walking back into the classroom. katsuki is at the front of the class showing the students the different things he can do with the little sparks he can create without making an outright explosion. izuku watches him with a soft smile from the doorway until katsuki turns his attention to him.
“you guys know this nerd is the best teacher you could ask for right?”
the kids start giggling and izuku’s eyes go wide. “katsuki enough.” izuku steps into the classroom. “go sit at the back so i can finish my lesson.”
“yes sensei.” katsuki smirks and makes his way to an empty desk in the back.
izuku tries his hardest to focus on the lesson but his eyes keep drifting to katsuki lounging in the back of his classroom. katsuki keeps chiming in and every time izuku immediately stumbles over his words, letting out a little huff. the bell finally rings and izuku dismisses his students with a sigh of relief and clicks the door shut behind the last one.
katsuki smashes his lips to izuku’s and pulls him flush against his chest. izuku melts into katsuki, gasping into his mouth when katsuki lifts him and carries him to his desk. he sets him back on the wood and kisses down his neck again.
“kats- kacchan..” his head lulls back.
“look so fucking good in this suit.” katsuki shakes his head.
katsuki’s hands squeeze against izuku’s sides, sliding lower until he’s unbuckling his belt. he slips his hand past the waist band, wrapping his slender fingers around izuku’s cock. izuku grips onto katsuki’s shoulders as he slowly starts to stroke him.
“please.” izuku’s hips jerk up.
“shhh.” katsuki leans back and looks at his flushed cheeks. “don’t want anyone to hear.” his grin widens.
he pumps him faster, thumb swiping over his leaking tip, leaning forward and swallowing down all of his sounds. izuku is gasping into katsuki’s mouth, fingers buried in his hair, trying to pull him closer. katsuki tightens his grip and izuku lets out a low moan.
“kats, can’t make a mess.” he shakes his head. “gotta teach class after.” he ends with a whine.
“should i use my mouth, sensei?” another glob of pre leaks out at katsuki’s hushed words. “gonna have to be quiet, izu.”
before izuku can process his words katsuki is lowering down, lifting up his shirt and pressing small kisses across his lower stomach as he slowly strokes him. he tugs his pants a little lower and traces his tongue around the tip making izuku bite on his knuckles to keep himself quiet.
katsuki slowly wraps his lips around izuku, sinking down, humming softly as he takes him to the back of his throat. izuku knows he won’t last, the setting, the warmth of katsuki’s mouth, his hero suit, all of it just too much. one of his hands is buried into katsuki’s hair still, the other clawing at the wood of his desk.
“kacchan- hic! i’m gonna.. gonna nghh!” his hand flies to his mouth as he starts to coat katsuki’s throat.
katsuki keeps sucking until izuku is pulling him off with a firm grip. he looks up at izuku as he licks his lips, helping him back into his pants. he leans up and takes izuku’s lips again, fingers adjusting his pants before cupping his cheeks.
“so handsome.” katsuki murmurs.
“are you.. are you done with work for the day?” izuku blinks up at him.
“yeah.” katsuki brushes izuku’s hair back.
“so.. you’re gonna be home tonight?” he traces a hand down katsuki’s chest.
“careful.. lunch isn’t that long.” katsuki chuckles, grabbing izuku’s wrist. “but yes, i’ll be at home waiting for you.” he presses his lips to his. “sensei.” he chuckles at izuku’s low groan.