A.N.: This story was commissioned by Anonymous. Please see my bio page for information if you were considering commissioning something from me. This is also a follow-up series to Nagisa's Lovely Encounter.
Disclaimer: I don't own Assassination Classroom.
Warning: Lemon!

A Day/Night with Nagisa

Tokyo

The day grew late, the sun starting to make its descent into the horizon, turning the sky a brilliant shade of orange. Inside the apartment, the afternoon rays shined on a head of blue hair, who was busy sitting at a desk with a red pen and a large stack of papers.

Nagisa Shiota didn't like to bring his work home with him, but final exams always forced him to take the papers home to grade them. He liked to get it done and over with quickly so he could enjoy the rest of his evening rather than worry about it in the morning.

His girlfriend, Hayami, was out visiting her parents for the weekend. It still amazed Nagisa that both Hayami and Kanzaki's parents were okay with their daughters in a polygamous relationship, especially since Nagisa never exactly could make a good first impression due to his tiny size and meek disposition. Yet to his surprise, both girls' parents gave their daughters their blessings. It was Hayami's mother's birthday, so the brunette wanted to spend the weekend with her to celebrate. This left Nagisa home alone with his other girlfriend.

That was perfectly fine with Kanzaki though. She had something she'd been waiting to use for a special occasion.

Nagisa put the last paper on the stack and clicked his pen shut, setting it down and sitting back in his chair. "Whoo..." he breathed, putting his arms back behind his head as his eyes glanced out the window. "Finally done. Wonder what Kanzaki's-"

"Oh Nagisaaaaaa..." sang a voice from down the hall. "You mind coming into the bedroom for me? I need your opinion on something..."

Raising an eyebrow, the blue-haired schoolteacher stood up out of his chair and walked around his desk, exiting the room and walking into the living room. "What's up...Kan...zaki..." He stopped in the entryway and stared at his girlfriend. As soon as his eyes became fixed on Kanzaki, the blood in his small body rushed south of the border and a tent started to form in his pants.

"Oh, I just wanted to show you my new cosplay I've been putting together. I just put the finishing touches on it right now. What do you think? Don't I look good?" asked Kanzaki, winking while striking a pose in her new cosplay outfit.

Nagisa knew that his girlfriend had always been a big fan of Sailor Moon, both the character and the anime series; so it was no surprise to the thin schoolteacher that the demure young woman would choose to cosplay as her favorite character: Sailor Mercury.

Trimming her hair and styling it to match the character of Ami Mizuno, Kanzaki twirled around in her Sailor Mercury cosplay outfit. The anime uniform hugged all of her curves in just the right way, her titties bouncing with every step. Her knee-high boots made her long, slender legs look even more beautiful than before. Her hands were concealed by white gloves that went all the way to her elbow. Like the character, Kanzaki also wore a blue choker that looked cute on her. Even the golden tiara she wore atop her head looked flawless. Despite mirroring the anime, Kanzaki had made some "adjustments" to the Sailor Mercury outfit. Her modified top had opened buttons in the middle, revealing some of her glorious cleavage. As she twirled around in her skirt, Nagisa could see her white panties flashing at him from underneath.

"I figured you should take a break from grading all those punks' papers. And considering how pent up you are," she added while staring hungrily at the massive bulge in Nagisa's pants, "I think you really need to let off some steam."

"I couldn't agree more. So, tell me, 'Sailor Mercury', should we go see if the bed needs to be purged of demons?" asked Nagisa with a knowing smirk. His first instinct was to take her right there on the couch but cleaning the stains got old after the two hundredth time.

Grinning, Kanzaki saluted her boyfriend. "Yes, sir!" Walking over to the tiny schoolteacher, Kanzaki picked him up and carried him down the hall. Nagisa was used to everyone taking advantage of his shrimpy size but still blushed anyway.

Walking into the bedroom, the cosplaying Kanzaki set her small boyfriend down. Her expert hands made quick work of his clothes, stripping Nagisa naked. Getting down on her knees, Kanzaki pulled down his pants. Her grin grew wider when Nagisa's huge manhood sprung at attention, smacking her square in the face. "Seriously, you sure you don't wanna be a porn star, Nagisa? You'd make a killing."

"I'd rather have only you and Hayami be the ones I fuck," Nagisa said with a smirk as she stood up.

"Yeah, us and the rest of the girls from 3-E," Kanzaki said with a knowing smirk before giving him a quick kiss.

The pair sat down on the edge of the bed. Nagisa wasted no time in giving her a kiss of his own, this one much deeper. "Mmmmh!" both moaned together while their lips became glued together, Nagisa's tongue dancing with hers. After a few moments of making out, their hands decided to stop being so idle. Nagisa's small hands eagerly reached for Kanzaki's breast, groping it gently while his free hand traveled across her smooth thigh before slipping underneath her skirt, fingers digging beneath her panties.

Kanzaki's muffled moan was drowned out by Nagisa's lips when she felt his fingers start rubbing her pussy. Her legs instinctively started to spread wider in response. Eyeing the throbbing mass of man meat nestled between his legs, Kanzaki wrapped her hand around his girth length and started to lightly stroke him.

The lovers lost themselves in the heat of their red-hot passion. Kanzaki showed that she wasn't wearing a bra when her bare nipples poked through the thin white fabric of her sailor shirt. "Ah! Ohhh..." She broke the kiss with her boyfriend and turned her head to the side, giving Nagisa the perfect opportunity to pepper her neck with soft kisses. "Oooohh..." When she felt one of Nagisa's fingers slip into her wet entrance, Kanzaki tilted her head back and smiled.

Nagisa moaned into his sexy girlfriend's neck and never stopped. Her gloved hand jerking him off felt sublime. A shiver ran up his spine when her thumb ran along the sensitive head of her lover's manhood, her gloved hand gliding up and down his veiny shaft. "Fuck, Nagisa. Is it just me or did your dick get bigger?"

Dragging his tongue up the side of her neck, Nagisa simply smiled. "Considering the way all of you play with my cock, probably." He watched her face twist with pleasure as he slid another finger into her hungry wet snatch, finding it adorable. The Sailor Scout pressed her lips against Nagisa's in another sloppy kiss, her hand jerking him off faster.

The horny cosplayer easily beat Nagisa to a climax. His lips still glued to hers, Nagisa watched in amusement when he watched Kanzaki's glazed eyes roll backward. The warm walls that surrounded Nagisa's digits became tight, her panties becoming soaked from her juices as they gushed.

Panting for breath, Kanzaki licked her lips when she felt Nagisa pull his fingers out of her cooch. "My turn." Her arm drew the schoolteacher close, giving him another kiss while her hand jerked him off faster. This time it was Nagisa who started to moan uncontrollably as the pleasure started to overwhelm him. Staring at the pulsing cock hungrily, the cosplaying Kanzaki reached with her free hand and cupped the small man's heavy balls. "Oooh, you've got a lot saved up."

Nagisa said nothing, merely groaning from the pleasure in his manhood. Gripping the edge of the bed, the schoolteacher arched his back and let out a deep groan while the pressure surged through his cock. "Fuck! I'm...gonna...blow!"

Bucking his hips, Nagisa came all over Kanzaki's hand, staining her white glove with his hot, sticky baby batter. Smiling happily, the cosplaying Sailor Scout watched as her hand was covered in cum. "Wow, we really should have you examined. The amount of sperm you make, you could populate a damn planet."

"Thanks, but...I'm not ready to be a parent. Not until you guys are," Nagisa said with a sheepish smile. The still-erect member twitched from knowing what was about to come next.

Taking off her stained glove, Kanzaki switched it out with another clean white glove she kept on the dresser before turning back to Nagisa. "You've gotten me in the mood, Nagisa. I want you to fuck me. I want you to fuck me right now." Walking over to the wall, the cosplayer put her hands on it while sticking out her ass and spreading her legs wide.

Stroking his cock while smiling at the slutty cosplayer, Nagisa slid off the bed and stood behind his taller girlfriend, flipping her skirt up and shifting her panties to the side. When he brought his cock up to her wet pussy, however, Kanzaki shook her head. "Not there," she said, reaching behind her and grabbed her boyfriend's cock, bringing it up until his tip nuzzled against her asshole. "Here."

Nagisa was surprised. Kanzaki usually was not in the mood to have some backdoor fun. 'She must be feeling really horny in that outfit if she wants me to fuck her in the ass,' thought Nagisa. Stepping away from his cosplaying girlfriend for a moment, the small schoolteacher walked over to a drawer and opened the top shelf, grabbing a bottle of lube that he kept for occasions like this.

Walking back over to his patiently waiting girlfriend, Nagisa returned to his position behind her and opened the bottle of lube, pouring a generous amount all over his long shaft before tossing it onto the bed. Spreading her bubble butt, Nagisa lined his lubed-up cock with her entrance and pressed the tip against her tight ring of muscles.

Despite the lube and bracing herself, a groan of pain still left Kanzaki's lips when she felt her asshole get invaded by her boyfriend. True, she'd taken Nagisa in the ass before so she should be used to feeling him fuck her by now. That was the thought that most of Nagisa's friends with benefit try to tell themselves as well. Yet every time Nagisa pushed into their asses, it was as if he was popping their black cherries all over again. Nagisa was just so big that it was impossible for all of them to get used to it.

After slipping the tip into his girlfriend's tight booty hole, Nagisa gripped her waist and started to make weak thrusts, inching his way deeper and deeper into her asshole. "So...tight..." he grunted.

"Nghhh!" Kanzaki's legs started to wobble from the strain. Tears threatened to spill from her eyes because of the pain of having her ass stretched. She knew that she was the one who wanted to do anal, and she'd mentally prepared herself, but with Nagisa's size, Kanzaki figured she was going to be limping tomorrow for sure.

Yet she knew that by the time they finished, she'd be howling for more.

"F-Fuck!" groaned the slutty cosplayer. "My ass...feels...nghhhh!" Nagisa's small hips smacked his cosplaying girlfriend's plump booty, her soft cheeks jiggling with each smack. Slowly he pushed deeper, Kanzaki's tight hole swallowing more and more of his cock. As her ass was stretched wide by her boyfriend's clamhammer, Kanzaki slowly started to relax her ass.

Feeling those hot walls' resistance to his thrusts start to weaken, Nagisa gripped his girlfriend's curvy waist tighter and started to move faster. The bedroom began to fill with the erotic sound of Kanzaki's ass being dominated by the schoolteacher's cock. Once the slutty sailor scout's tight ass finally loosened enough around the thick meat-stick inside of her, Kanzaki began to shake her hips to buck into his thrusts.

Kanzaki let out a groan of disappointment when she felt her ass suddenly become emptied of her lover's manhood, just starting to feel good after relaxing her ass. Her confusion ended when Nagisa put his hands on his hips and turned her around, pushing back against the wall. The couple shared a lewd, sloppy kiss before the small schoolteacher gripped her soft thigh and raised her leg up onto his shoulder before sliding his cock back into her warm hole.

"Ah! Yes! N-Nagisa!" Facing her boyfriend, Kanzaki let the blue-haired schoolteacher see her face twist with unadulterated pleasure. "F-FUCK!" Her head hit the wall when she threw it back, her arms wrapped around Nagisa's thin shoulders tightly. "My ass is on fire!" she wailed.

Grunting hard like a horny beast, Nagisa squeezed his cosplaying girlfriend's thigh and continued pumping hard into her tight asshole. The intensity of her hot walls gripping him was becoming too much for him to bear and watching the beautiful noirette's face twist with lewd pleasure was the icing on the cake.

"Ah! Ah! Ahhhhh!" The burning pleasure in her ass was too much for the cosplayer to endure for long. Her nails dug into Nagisa's shoulders, adding to the litany of marks that he'd been given by Hayami and his other 'Friends with Benefits'. "Fuck me! Fuck my ass! Nagisa!"

The tight asshole grew tighter as climax took hold of Kanzaki. Clinging to her small boyfriend, the noirette cosplayer cried out in absolute ecstasy, her pussy gushing while she tightened her ass around her lover, choking his manhood in a hot vice. Nagisa watched his cosplaying lover's face twist from the pleasure, the sight of it making him want her even more.

The tight clamp around his cock was too much for one small, horny schoolteacher to bear. Grunting hard into Kanzaki's face, Nagisa gave a few more thrusts before that familiar surge of ecstasy rushed through his shaft, his tip twitching before he let it all out inside Kanzaki's asshole. The noirette went limp, her arms falling to her sides as an intense wet heat flooded her back door. Nagisa pumped his cum into her booty, staining her inner walls white with his seed. "Fuck," groaned the small man, his fingers digging into Kanzaki's thigh. "Your ass just gets tighter and tighter every time I fuck it."

Pulling out of the cum-filled Sailor Scout, Nagisa helped carry her over to the bed. Kanzaki was thankful since her legs felt like her bones had been replaced with silly putty and knew she'd fall over had Nagisa not been there. She lay there on the bed, her chest heaving for air while her sweaty body cooled down. Turning her head to the side, she watched Nagisa go into the bathroom to clean himself up and closed her eyes, her tired body relaxing.

When she felt a weight on top of her, she opened her eyes and realized she'd dozed off. Straddling her waist, Nagisa smiled down at her while his hands softly groped her chest, massaging her titties through her Sailor Scout cosplay. One of the things that Nagisa had picked up since his time as a would-be assassin in 3-E was how to give a good massage; he had to put his small hands to use somehow, after all. And with so many 'Friends with Benefits', he'd gotten quite a lot of practice and knew just where to massage to get the best reactions.

"Ooooh..." Kanzaki threw her arms over her head and arched her back in response to her small boyfriend's pleasurable massage. Leaning down, Nagisa gently pressed his lips against hers. The loving couple made out for a few seconds before Kanzaki gestured for Nagisa to lean back. Looking up seductively at her lover, the cosplayer reached for her outfit. Slowly, teasingly, she began to unbutton her top. As soon as her shirt was finally opened, Nagisa's small hands slipped underneath Kanzaki to unclip her bra, pushing it up and letting her breasts come out to play.

Hungry to please his girlfriend more, Nagisa carefully removed her bra before he cupped her busty chest with his hands. Now able to massage them freely without having her cosplay outfit obstruct him, Nagisa gleefully groped and teased Kanzaki before giving her hard, pink nipples a taste. The Sailor Scout wriggled and moaned on the bed when Nagisa's lips wrapped around her tit, suckling her like a baby. Her hands went to the schoolteacher's head, running her fingers through his soft, blue hair. The pleasure in her chest was heavenly, only getting better when her lover dragged his tongue across her breasts and started to lick and suck on her unabused nipple.

While indulging himself in Kanzaki's chest, Nagisa slipped his hands underneath the Sailor Scout's skirt and hooked his fingers on the hem of her stained panties. Feeling Nagisa's hands underneath her, the noirette lifted her hips and smiled as he pulled them away from her wet womanhood. Nagisa pulled her underwear down and let them dangle around her right ankle before he turned his focus back to his girlfriend.

Knowing what Nagisa wanted, Kanzaki spread her legs and beckoned her boyfriend with a finger. After getting her ass railed, it was time for her pussy to get in on the fun too. Gripping his shaft, the blue-haired schoolteacher aimed his cock at her wet, pink lips. "Put it in," purred Kanzaki, a shiver running up her spine from feeling his top nuzzle her sensitive lips. She'd been craving this ever since she put on the cosplay outfit. "Fuck my pussy."

Nagisa gave a short thrust, making the cosplayer gasp and moan with pleasure when he entered her womanhood. Kanzaki's pussy was already accustomed to the man's huge girth, yet she still felt pleasure surge through her veins as she was filled to the brim. Her pussy instantly tightened around his meatrod, Kanzaki already craving his inevitable creampie.

Lust pumping through his veins like a narcotic, Nagisa quickly found his rhythm and fucked the Sailor Scout silly. The bed creaked and rocked while the lovers on top fucked like crazy. Moaning from every thrust, the cosplayer gripped the sheets beneath her while her womanhood was reshaped by his cock. "Yes! Fuck! Faster! Ah! Harder!"

Letting go of his girlfriend's waist, Nagisa grabbed her legs and put them on his shoulders, letting him fuck the cosplayer at a deeper angle. The bedroom once more became filled with the sounds of grunts and moans, the bed shaking like an earthquake was happening. Sweat poured down Nagisa's naked back while he pumped in and out of Kanzaki with all the force his small body could muster up.

When Nagisa let go of her legs, the cosplayer took the opportunity to wrap them around his thin waist to keep him locked nice and tight inside of her. She wanted to feel Nagisa's baby seed inside of her and wasn't going to give him the option of pulling out.

With his hands freed and his hips on lockdown, Nagisa pressed his small body into Kanzaki's, alternating between deep, sloppy kisses and attacking her breasts. Kanzaki was pushed through one orgasm after another, her body constantly writhing in ecstasy. Looking at her boyfriend's straining face, Kanzaki knew the man was nearing the end of his rope. "Come for me. Come right in my womb," she begged, her toes curling while her body tensed in preparation.

Kanzaki's hand reached for Nagisa's head, silencing his moan of pleasure when he finally let go and shot his load inside of her. "Mmmmmhhh!" Kanzaki felt her body melt as her womb filled with cum, the heat combining with the hot load he'd already pumped into her ass.

When they separated for air, Nagisa slowly pulled out of his girlfriend's cunt, admiring his handiwork as a trickle of cum leaked out of her stuffed honeypot. Lying down next to her, the naked schoolteacher cupped Kanzaki's' face and smiled lovingly at her. "I love you, Kanzaki."

"Ah," the noirette put a finger to his lips and returned his smile with a teasing one of her own. "Sailor Mercury."

"Right."

Sitting up, the cosplayer stretched out her arms behind her head, her boobs jiggling freely. She was about to say something when her cellphone started buzzing on the nightstand. "Oh?"

"Who is it?'

Kanzaki grabbed it and checked who'd texted her. "It's Hayami. Looks like she's heading back from her parents."

"That was quick."

"We should probably clean the place up."

"...Think we have time for one more round?"

"Oh Nagisa..." The girl cosplaying as Sailor Mercury grinned. "I'm always down for another go."

The cosplayer pounced onto her well-endowed boyfriend. Nagisa knew that by the time Hayami came home, they would have to clean up an even bigger mess.

He was fine with that.

The End