"Nagisa, may you please come to the front and work this problem out for the class" those faithful words spoken by the blue haired boys homeroom teacher bought him back from the concentration he was putting towards containing the contents of his aching bladder
"W-what but why m-me?" The boy stuttered out objectifying, failing to hide how he tensely bit his lip
"Well, it was seeming to me you had lost interest in my lesson" he lifted one of his yellow octopus like appendages of which contained a single piece of chalk pointed towards Nagisa whom was struggling to sit still in his seat "please pay more attention or else you'll fall behind"
"I'm so s-sorry sir it won't h-happen again...I promise" he bows as a way of showing apology using it as an excuse to shove his hands into his crotch to help keep back the floodgates
Koro sensei returned to his lesson causing everyone's attention back onto their tentacle having teacher. All eyes, except those of a certain red-haired deviant stationed at the back of the class who had been keeping watchful eyes on Nagisa's obvious discomfort. The act of shoving his hands into his crotch between crossed legs was the final piece of evidence to suggest the source of the boy's odd behaviour; he needed a potty break, and desperately. It left Karma wondering why he didn't just ask to be excused. It was all very strange to him.
15 minutes pass
By now the blue haired boy was squirming around constantly, unable to remain still on his chair. Crossing and uncrossing his legs, and constantly shifting his position and posture, tapping on the floor with his foot and even going as far as to put a hand in his pocket to grab at his member; the only thing that was keeping him from the embarrassment of sitting in a puddle of his own urine. At subsonic speeds koro sensei would appear beside the boy uttering his name.
"Nagisa!" He spoke it strictly and clearly, aiming to get the boys attention.
"Wah, ah-" caught off guard by the sound of his name being called, causing him to lose control momentarily and allow a few spurts to escape into the seat of his pants. This caused the blue haired boy to slouch over in his seat and jam his hands harder against his crotch; uttering the word 'no' repeatedly under his breath which had now grown quite heavy.
"Are you ok young man? It looks as though something is bothering you." their octopus homeroom teacher seemed rather concerned for the boy so suddenly, his behaviour was odd and unlike that of Nagisa.
"N-no sir! N-not at all! Just having trouble concentrating is all..." he slowly pulls his hands away from his crotch hoping no one noticed his how he was palming himself through his pants and looks up at koro sensei to speak to him
"Well, if you say so. But-" his iconic laugh, behind grinning teeth which seem to taunt nagisa "I cannot allow this disrespect to go unpunished! Please make your way to the front and correct the grammar in the sentence on the board."
"Wha- but! I'm, I-I uh..." The blue haired boy exhaled deeply, biting the bullet and accepting his fate. "Fine." He stands up slowly feeling the contents of his bladder slosh around in his lower abdomen. He took the chalk that Koro sensei held out to him and began his agonising trudge towards the front of the classroom, each step he took made it feel as though he may burst at any moment; trying desperately to keep his thighs together to stop any unwanted leaks from escaping. But to no avail, as he made his way closer to the board small spurts of urine began shooting into his underwear causing them to become warm and damp; a blush appearing across the boy's cheeks as he stood in front of the board. All he had to do was correct the grammar in the sentence, easy right? Well Nagisa was proven wrong fairly quickly, turns out holding back a full bladder whilst trying not to squirm around was much of a task in its own right. But trying to fix a grammatical error in a language that isn't your spoken one at the same time was absolutely agonising. All eyes were upon him and he was trying his hardest to not make his desperation blatantly obvious though he couldn't help but grab at and around his crotch, biting his lip so hard he could swear he could taste blood; hoping the pain would help distract from the stabbing pains in his lower abdomen. It took the boy a moment to realise the mistake in the sentence, though less than a minute had passed though in all of his panic he could swear it had been longer. He went to move forward to correct the mistake when he felt himself leak again and then again this time they were longer and soaked into the front of his pants, he jammed both hands into his crotch with no hesitation to try and stop himself from having an accident in front of the entire class. But it was too late, those leaks came in longer spurts until finally they developed into a steady stream "N-no I c-can't...gyah-" the blush on his cheeks grew darker, now far more noticeable than before.
"Nagisa, are you ok? If you're feeling unwell I can always-" koro sensei begins walking towards nagisa concerned for his students health, caught off guard and interrupted by the slamming of someone's foot against a desk towards the back of the room.
A certain red haired brat had kicked his feet up onto his desk with a rather annoyed sigh, a look of disappointment plastered upon his lips his sharp blood tinged eyes hidden behind closed eyelids "Careful teach, you're in the splash zone."
The octopus turned to look at young Karma Akabane wondering what he could be referring to "What's that supposed to mean? And get your feet off of the desk-'' Koro sensei is once again interrupted by the pitter patters of something hitting the hard wood floors of the old campus building, turning his attention back towards the near silent sobs that came from Nagisa.
Why him? Why now? Why here of all the places? The blue haired boy was caught in an inner turmoil as the contents of his bladder relieved themselves into his pants and onto the floor of the classroom, the clearish yellow liquid making little to no noise when it hit the ground, as it added to the steadily growing puddle beneath Nagisa's feet. The dampness of his underwear which stuck to his thighs left a rather unpleasant stinging sensation as it rubbed against his skin; he had long since accepted his fate, no longer squeezing his thighs together and just allowing to all flow out the bitter sweet and almost orgasmic relief of finally being able to relieve himself had him caught between feeling a sense of ecstasy and embarrassment for commuting such a childish act. His stream continued to go on for close to a minute and a half before it began to die off, slowly becoming nothing more then a trickle before dying out completely. The blue haired boy stood there for a moment revelling in the bliss of an empty bladder, ignoring the feint stinging in his lower abdomen and the wetness of his clothes; the smell of urine which had begun to fill the air snapped him free of his haze as the reality of his predicament had begun to dawn upon him, tears filled the boys eyes as he looked towards koro sensei who had a look of sympathetic shook on his face. Managing to gather up whatever remained of his dignity and composure he spoke "Koro sensei, may I please be excused?" His voice sounded weak and timid, cracking and breaking between tearful eyed words.
Koro sensei responded immediately, with as much composure and resprectfulness as he could manage in the situation "I think that would be for the best Nagisa"
With a nod Nagisa turned towards the door and began walking towards it, tears rolling down his face before he could even leave the room. As their blue haired classmate left the room and the feint sound of footsteps down the hall grew quieter and quieter until they eventually stopped, everyone remained deathly quiet unsure of what they should do. This was just another strange day in their assassination classroom...