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Warning: Lemon!

A Day/Night with Nagisa

Two Days Later…

Tokyo

Nagisa walked up the path to Okano's face, keeping his bag of exercise clothes slung over his shoulder. It was the weekend, giving him the time to visit his friend for some much needed exercise. Instead of his usual teaching attire, he wore a simple white t-shirt and gym shorts. But considering that this was Nagisa, the exercise that the brunette was far more sexual than what most trainers would put their students through. Not that Nagisa minded one bit.

The idea had been started when Okano was holding regular yoga sessions with her old classmates. The girls had taken Korosensei's lessons of keeping a healthy body to heart so they would gather at Okano's once a week or so to do some light exercising. When Nagisa had been brought along one day by his girlfriends, things escalated quickly to the point where Nagisa had spent the exercise plowing the three women until he was laid out on the mat from exhaustion.

Afterwards, the girls had come up with the idea of Okano giving Nagisa sexual exercise lessons. After all, if he has to please so many lovely ladies, it was probably a good idea for him to keep himself fit. And who better to help than Okano?

It'd been a while since Nagisa had one of his sexual exercises, often too busy grading papers. However, he figured that a little "stretching" would be just the thing to ease some of his sores. Walking up to Okano's house, Nagisa rang the doorbell and patiently waited.

"Hang on! Be right there!" came a voice from behind the door.

After waiting a moment, the door opened up and the happy gymnast, Okano, stepped out to meet her guest. "Nagisa! It's so good to see you again! Come on it and we'll get started on your exercises!"

Nagisa was a bit taken aback when he saw the slim brunette. Unlike the tank top and yoga pants she normally wore, Okano was wearing something quite…different. "Erm…Okano, that's a…new outfit." If the goal was to get Nagisa ready to "exercise" from the sight of her outfit, then Okano had more than accomplished that mission.

The brunette giggled at Nagisa's innocent reaction. "I was at a convention yesterday and wanted to show you my costume before we started. How do you like it? You know I was always a big fan of fighting games. It took me a while to make it myself but I did a good job, don't you agree?" she asked while striking a pose.

Nagisa could only nod in agreement, cheeks turning red as he beheld the slim brunette in her sexy new cosplay. Being a fan of Dead or Alive games, Okano was wearing the kunoichi outfit of Ayane but to call it a kimono would be too generous. The outfit she wore covered next to nothing, her chest nearly popping out of the "dress" she had on. The purple fabric wrapping just above her pink peaks and winding down to just above her crotch. The end of the outfit didn't even completely cover her purple panties, her underwear peeking underneath the dress. Toying with the long sash that wrapped around her stomach and kept her outfit from sliding off her body and exposing herself to all her neighbors, Okano teased him with a flirtatious smile, knowing full well what was going on in the young teacher's horny mind. Tugging lightly at the massive bow behind their back and trailing a hand down the ends of the sash that draped over the ground. The only modest covering on her body was the matching purple arm sleeves, thigh-high stockings and boots.

"I think Bitch-Sensei would be very proud right about now…"

"Heheh, that's good to hear. Ritsu told me about how she showed up at your apartment and helped you out with your little daydreams."

"…She talks a lot for an A.I., doesn't she?"

Giggling, Okano pulled a Bitch-Sensei by reaching into her tits to pull out her phone, her outfit obviously to skimpy to have pockets. "She did more than just tell me." Turning on her video app, she hit play and showed her phone to Nagisa. A grin stretched across her face when she saw Nagisa's reaction to the video.

The blush on Nagisa's face intensified when he saw a recording of him pounding a cosplaying Irina's pussy in his bedroom, the assassin with her feet dangling in the air as the horny teacher smashed her pussy to match the size of his cock. "Please don't show that to my students. Either I'll die from getting fired or they'll die from seeing my sex life." An even worse thought occurred to him; what if Ritsu ever decide to show the video to Karasuma? Sure, the two were in a trial separation but he doubted the man would keep a cool head if he saw footage of his student fucking his wife.

"Heheh, don't worry. None of us would do anything like that to you. It's just a little something to keep me busy whenever you and I aren't having one of our sexual exercise session. Speaking of which…" Sliding her phone back into her tits, Okano grabbed Nagisa by the hand and pulled the small teacher into her home. Nagisa followed her through her large home before she brought him to her personal fitness studio. Taking her phone out of her tits again, she set it on a table near the door before bounding up to Nagisa, purposefully making her large titties bounce with each step she took; Nagisa kept expecting her huge, soft breasts to completely spill out of her sexy ninja outfit.

"Alrighty! Let's get started with some light stretching! You can get started with whatever makes you comfortable while I do my gymnast stretches."

Turning on some music to get them both motivated, Okano started to stretch in front of Nagisa. While Nagisa was limber enough thanks to his thin physique, he kept himself to simply doing basic stretches like he was back in Karasuma's P.E class. Okano, meanwhile, showcased the full range of her flexibility and showed that she hadn't lost a step in the years since graduating from Korosensei's. Okano did a standing splits, raising her right leg to give Nagisa a good view of her purple panties. Turning around, the cosplaying ninja bent over, her kimono riding up to show off her toned butt. She leaned backward, letting Nagisa see her cleavage threatening to spill out of her lewd cosplay outfit's top.

Her stretching got the effect that Okano had been waiting for. Nagisa's blood had started to pump into his manhood when he got a good look at her new cosplay outfit but Okano's showing off with her erotic stretching made a tent get pitched in his gym shorts. Smirking, the gymnast cartwheeled over to Nagisa and wrapped her arms around him. While Okano had once been the shortest girl in the Assassination Classroom, time and maturity had given her a full foot in growth, now looking down at the tiny teacher. Her leg brushed up against his pitched tent, a wet spot appearing in her purple panties as Nagisa's hands reached around to cup her firm ass.

"That's enough muscle stretching, don't you think?" she said with a giggle. "Now let's move on to tongue exercises."

Cupping Nagisa's cute face, Okano stuck out her tongue and plunged it into the erect schoolteacher's mouth. "Mhhhhhhh!" Opening his mouth wide, the blue-haired man squeezed Okano's rear while his tongue collided with hers. Nagisa's greedy hands continued to squeeze her soft ass while enjoying the softness of her breasts as they pushed against his chest, the top of her hard nipples peeking out of the kimono. Okano's hand reached down to palm her friend's cock, already imagining how the rest of the day was going to go down.

Neither wanted the kiss to end but air quickly started to become a need. Their lips parted and the two panted for breath, a string of sticky saliva still connecting the lovers. "You're more energetic than usual. I'll have to wear my cosplay outfits to our exercise sessions more often!" chuckled Okano.

"I couldn't be opposed to that idea," Nagisa confessed.

Giggling, Okano reached down to pull Nagisa's gym shorts down enough to let his manhood come out to play. The brunette stared hungrily at the teacher's huge clamhammer, shivers running up her spine as she imagined in her head all of the lewd poses they could fuck with a cock that big and long.

Pulling Okano against him, Nagisa slid his cock between her thighs, hot moans hitting Okano in the face as she closed her legs together to let him get off with her thighs. "It's so big…" cooed Okano as she felt that huge log of meat rub against her cooch, her panties starting to become completely soaked as she felt his girl pump in and out of her thighs. Holding Nagisa tightly, the cosplaying gymnast decided to give his tongue another work out while he exercised his cock with her thighs. "Mmmmmh! Mmmmh!"

Nagisa smeared the insides of Okano's soft, toned thighs with his pre-cum as it dribbled from his large tip. His shaft was starting to become drenched from her wet panties. Already Nagisa could feel the pressure start to build inside of him and the pleasure in Okano started its slow build to a crescendo.

But before the couple could get each other off, they finally broke the sloppy and lewd kiss and Okano reluctantly pulled herself away from his embrace. She walked back over to the stereo, making sure to shake her hips with every step to continue enticing Nagisa and turned off the music. "I think we should exercise somewhere a little more comfortable." Taking Nagisa's hand, she led him out of her exercise studio, she led him down the hallway and up the stairs until they made it to her bedroom.

No sooner had they entered, Okano went to work stripping Nagisa naked. "For better flexibility," she told him with a teasing smile, still keeping up the appearance of a fitness instructor. She pulled his shirt over his head and pulled his gym shorts and underwear down to his ankles, Nagisa kicking out of them to stand before Okano in his birthday suit, her eyes glued to his third leg.

"You know, I'm starting to get all hot and sweaty from all that stretching and warm-up exercises," said Okano as she reached for her obi. "I'd better get more comfortable too…"

The first thing to go were her thigh-high boots. Undoing the obi, the gymnast let her lewd cosplay fall to the floor, standing before Nagisa in just her detached arm sleeves, her thigh-high socks and her soaked purple panties. Nagisa's eyes stared with equal hunger at her jiggling breasts, sweat beading down her lovely melons while her hard nipples jutted out, begging to be sucked.

"Ready for the first exercise?" Grinning at her naked friend, the gymnast hopped up onto her bed and laid down, beckoning for him to join her. Grabbing her hips, she pulled her legs back and stared down at Nagisa with a lewd grin. "Go ahead and pick whichever hole you want to fuck first. My pussy and asshole have been in need of a good exercise in cock pounding."

Spotting a bottle of lube on a nearby drawer that conveniently was nearby, Nagisa eagerly grabbed it and uncorked the bottle. Okano's asshole twitching under her panties from the anticipation as Nagisa coated his huge third leg with the anal lube, making it glisten in the afternoon sunlight.

Dipping a knee onto the bed, Nagisa made his way to the horny gymnast. Grabbing her toned legs, Nagisa pushed them up until Okano was bent over herself like a pretzel. Nagisa took full advantage of the girl's flexibility by pushing her lower half up until her legs were bent over her head. Okano bit down on her lower lip and shivered as the blue-haired man pushed aside her wet, purple panties to reveal her dripping pussy and her twitching asshole. Her hands grabbed the sheets while she mentally prepared herself, watching Nagisa gripped his lubed up cock and line it up with her tender asshole.

Okano relaxed her ass as Nagisa's tip pushed against her, letting him into her ass. However, despite taking Nagisa in the danger zone before several times to learn how to relax her asshole, that first plunge of his cock still made her throw her head back and cry out in pleasurable pain. Lube and relaxation only went so far when Nagisa was so well-endowed. "Nghhh! Ahhhh!"

Nagisa tried to go slow, pushing a little in before pulling out and pushing a little further. Again and again he repeated this. His hands dug into her firm ass, watching as her tight hole swallowed more and more of his cock until he was already halfway inside her. The intense heat and tightness of Okano's ass made Nagisa struggle not to bust a nut already, her greedy hole starting to loosen up.

"Oooooohhhh…" Okano felt like she was being split in two. Her asshole felt like it was on fire once the sudden fullness of his cock hit her, the gymnast impressively taking Nagisa balls deep in her ass. She almost went cross-eyed as she took in all of Nagisa's cock. "Fuuuuuuuck!"

Feeling Okano start to loosen up around him, Nagisa squeezed her soft ass and started to pump in and out of her asshole, his hips moving with more force and speed. Okano threw her arms over her head, becoming nothing more than a slutty onahole for her lover to fuck in a pile driver position. "Yes! Yes! Oh fuck! My ass! My ass feels so good!" cried out Okano, tears starting to leak from her eyes, her pussy suddenly squirting lewdly all over his waist. "Fuck! I'm coming! It's too gooooood!"

Okano's tight hole grew tighter but Nagisa slammed in and out of her undeterred, determined to make sure Okano was wholly pleasured. He smirked from seeing her slutty expression, a far cry from the soft-spoken girl he once knew back in the Assassination Classroom. But he was far from done yet. This was supposed to be "sexual exercise" after all and Okano was only having one of her holes getting a good stretching…

His eyes noticed something sticking out from underneath her pillow, recognizing what it was instantly. Grinning, Nagisa reached and pulled out the huge dildo from the pillow. "Were you using this when I'm not around?"

"I…need to have…something…to keep me company…when you aren't here," grunted Okano before she lewdly came again. "Ah! Fuck! I'm coming!"

Eying her squirting pussy, Nagisa guided the toy to her quivering lips and pushed it in. Feeling both holes being fucked at the same time, Okano's moans became lewd wails of ecstasy. Her holes tightened around the real and fake cocks imbedded inside of her, her lower half melting from the sensation flourishing as the pleasure started to make her go crazy.

"Fuck! Ok-Okano!" grunted Nagisa, fucking her asshole as hard as he could, the tight grip her ass had on his cock making him reach the end of his rope. "I'm…I'm coming!" His eyes squeezed shut as a hot sensation surged through his cock, the tip of his manhood so deep inside of Okano that the gymnast thought he was touching her stomach before he let loose. "Ahhh! Ahhhhhh!"

Okano's eyes rolled into the back of her head, her lower half melting. Hot cum flowed into her ass, her toes curling while she squirted around the toy lodged in her cunt. Nagisa didn't pull out until he was completely done, enjoying the look on Okano's face as she basked in the bliss of her anal creampie, Her heavy breasts heaving for breath while sweat rolled down her panting face. "Ngh!" went the gymnast when Nagisa slowly eased his erection out of her asshole, admiring his handiwork as cum trickled out of her gaping ass. Letting go of her hips, Nagisa let her lower half fall down onto the bed before getting up to clean himself up.

While lying there on the bed waiting for Nagisa to come back, Okano rubbed her warm belly. Stretching out on the bed, she took deep breaths while coping with the stinging pain in her stretched-out ass. Her hand went to the toy still in her pussy and began to twist it a little before slowly pulling it out. She couldn't fight the disappointment as her hole was empty, her holes twitching as if begging to be filled again after being fucked so wonderfully. Bringing the sex toy to her mouth, she put it against her lips and closed her eyes. "Mmmmmh…" Her free hand reached down and touched herself while she licked the sex toy in her hand, tasting her own juices on its rubber surface. In her mind she imagined she was licking Nagisa's huge cock after he finished pounding her pussy. "Mmmmmmmmmmmh…" she moaned, rubbing her clit. Every move she made caused her ass to sting a little but it made her pleasure all the more intense.

Okano didn't realize that Nagisa had returned until she felt a hand on her wrist, gently pulling the dildo away from her mouth. Opening her eyes, she saw the blue-haired man sitting next to her on the bed, having finished cleaning himself up. "Ready for more? I think we need to exercise your pussy a little, don't you?" He teased the girl by dipping a hand under her purple panties and fingered her sopping wet hole.

Okano said nothing, sitting up and wrapping her arms around Nagisa. She passionately made out with her lover, dropping the dildo onto the bed so she could run her hands through his blue hair, messing it up while he palmed her tits. "Mmmmh!" moaned both lovers before Okano reached down to grab her sex toy. She placed it in Nagisa's hand and smiled lewdly at him. "My ass is going to need a workout partner while my pussy is getting its exercise."

Nodding with a smirk, Nagisa pushed her down onto her back for a moment to pull off her stained panties, her useless purple underwear soaking wet from her juices and Nagisa's sticky, hot cum. Gripping the toy, Nagisa brought it around her curvy waist and ran it up the crack of her ass until the tip pushed against her abused hole. The brunette gymnast's breath hitched when she felt the toy push into her gaping hole. Okano's ass greedily swallowed the thick sex toy as it slid into her, her lubed up walls thankfully letting it push into her without risk of tearing up her asshole. Nagisa pumped the toy into her butt until she'd almost taken the entire toy up her ass. Kissing her neck to help keep her relax, Nagisa's hand gently massaged her ass's tender cheeks before his thumb found the special button on the bottom of the dildo.

VRRRRRRRRRRRR!

"Ah! Kyaaaaa!" Clinging to Nagisa, Okano let out a cry of ecstasy from the buzzing in her stuffed ass. Nagisa upped the ante by digging his fingers into her toned hips and lifting her up off the bed. The dildo still abuzz in her butt, Okano wrapped her arms around his thin shoulders as she was lifted up into the air.

Showing off his surprising strength, Nagisa lifted her up and lowered the gymnast down onto his dick, her pussy swallowing his cock until he bottomed out her womanhood. Feeling both holes getting stuffed again flipped Okano's switch. Her legs stretched out into a wide V. Digging her nails into Nagisa's shoulders, the brunette clung to him as his hips started to move. "Ooooh! Yes! Oh yes! Work that cock! Stretch my pussy! Stretch it good!"

Nagisa hoped that Ritsu was still spying on them and recording their "sexual exercises" because he really wanted to listen to Okano's dirty talk whenever his girlfriends were out of town and he was home alone.

The hard cock in her pussy continued to grind against her sweet spots while the toy in her ass buzzed away. Once again Okano felt her lower half completely melt from the intense heat in her loins. "Ghh! So good!" she groaned, arching her back. "Fuck! You're bigger than before!" she exclaimed.

The remark made Nagisa chuckle; everyone always said that whenever he fucked them after it'd been a while since he had a one-on-one with them. Whether they were actually right and his cock was growing or not, it was still a huge boost to the young teacher's ego.

The pleasure in her loins made Okano's head spin. Her legs wrapped tightly around his waist, never wanting him to pull out of her. She dug her heels into Because of the stark difference in height between the two, Okano's breasts jiggled right in front of Nagisa's breasts. Eyeing the brunette's bouncing melons, Nagisa buried his face in her sweaty tits, Okano giving a lewd moan when she felt his tongue start to lick her sensitive tits. His lips wrapped around her tit, Nagisa suckling her like he was trying to draw milk from the gymnast.

Okano's mind was going blank. The cock in her pussy kept grinding against her special spots and the buzzing in her asshole didn't stop. Heat start to burn in her chest from Nagisa's licking and sucking. "That's it, Nagisa! Fuck me! Fuck me harder!" she pleaded, leaning forward and pulling his head out of her cleavage to make out with him again, her tongue exploring his mouth while she let her passions run wild.

Unlike before there was no huge scream of pleasure when Okano came. With her lips glued to Nagisa's, her moan of release was muffled by the kiss. Nagisa felt the gymnast squeeze his cock, her plugged cunt squirting onto the floor, her juices splashing against his balls. His hips moving with a mind of their own, Nagisa lost himself to the feeling of his own climax. His brain melted as he came inside his fuck buddy, letting Okano swallowing his moan.

Her strength giving out, Okano went limp in Nagisa's arms. He slowly pulled out of her cunt, his cum oozing out of her hole after marking her womb with its warm wetness. Continuing to make out with the brunette, Nagisa carried her back over to the bed, taking care to gently pull out the vibrating dildo before turning it off and tossing it to the floor.

The pair laid on the bed, bodies covered in a sticky sheen of sweat. Okano laid on top of Nagisa, a content smile stretched across her face. "I vote…we take a little break…before we get back to more sexual exercises. I already have mind all planned out in my head."

"Oh really? And what did you have in mind?"

"Oh you know, the usual. Pushups. Sit-ups." Okano's hand reached down and stroked Nagisa's cock, working him back to life. "And plenty of juice…"

To be continued…