Requested by: gabbycline2 and spacetries
Request: Stein and the reader are secretly dating, and some guy flirts with the reader, which pisses off Stein//Stein x teacher!reader where they are colleagues, and Stein wasn't able to confess his feelings for the reader when they were young, and he gets pissed seeing Spirirt flirt with the reader. SMUT
WARNINGS: Smut, a lot of it.
Word Count: 2,165
Song: Lights Down Low Nightcore
A/N: So, both requests were basically the same, sort of. So I decided to combine them. I apologize  if this is confusing. To the people that requested, if you don't like how this turns out, please tell me. And, I will redo your requests, separately.

3rd POV

    Y/N Y/L/N was a teacher at Death Weapon Meister Academy, or for short, DWMA. She had willing asked Lord Death if she help out in the academy, since she had graduated from DWMA. Mostly, because the halls of the academy brought back small memories, mostly her childhood friend, and crush, Stein. When she overheard someone mention Stein, thoughts ran through her head. Y/N wanted to believe that it was her old childhood friend, and crush, but at the same time, it seemed impossible.

    It was during after school hours, when her thoughts were put at rest. Y/N was making her way out of the academy, when she saw a very tall figure ahead of her. At first, it looked like it was moving towards her, but stopped. Just wanting to get home, she continued to walk down the hall, getting closer to the figure.  "Y/N?" Right away, as if hearing the voice helped her memory, she knew right away who it was.

    "Stein?"

    He had walked her home that day, both of them catching up. Y/N couldn't help, but want to cry, remembering how much she missed hearing him go on about his love for dissecting. And, he felt the same way, missing the way how Y/N would talk about her interests. Stein didn't think it was possible, but it was. The feelings he had for his friend, and the feelings she had for him, came rushing back during that small conversation.

    If he had to make a list, of all the things he missed about Y/N, that list would be small. Why? Because, the only thing on it would be: everything.

    Yet, here he was, the bell had rung, and he was just grinding his teeth together, angry filling his whole body. Spirit knew Stein was in love with Y/N, yet there he was, flirting with her. 'Once a player, always a player,' Stein thought, looking away from the two, but somehow his eyes went right back to them. Spirit was saying some flirty things, while Y/N just stood there smiling, ignoring his attempts of flirting.

    Her eyes wandered a bit, soon landing on Stein, who just stood there, watching them. "So Y/N, how would you like to get a drink with me tonight?" She brought her attention back to Spirit, and gave him a sweet smile. "Actually..." she started, before she felt someone grab her hand, and pull her backwards. "She's busy tonight." Y/N looked up to see a very pissed off Stein, and something told her that this wasn't gonna be pretty.

    "Oh, she is? Do you know her plans?" Spirit asked, his voice having a very noticeable squeak in it. "Indeed, I do," was all Stein said back, before he started walking away, pulling Y/N with him. It wasn't normal seeing Stein this mad. And, Y/N was a bit scared. Usually, he would be calm, or at least she thought he was calm, and wouldn't show his emotions. And, all those times when Y/N wondered what Stein was feeling, she kinda regretted now.

    She rather see him emotionless, then how she was seeing him now. 'Fuming,' she thought. Thats the word. And, seeing that he was doing exactly that, Y/N was a bit afraid, of what might happen. Confusion washed away the scared feeling, when he brought her into his classroom, locking the door behind him. Her mind went blank, when Stein pressed her against the wall.

    "Stein, what's going on? Are you okay?" Stein removed his glasses, and nuzzled his face into the space between her neck and shoulder. "No, I'm not okay," he said, as he placed his hands onto her waist, pulling her closer to him. "Stein?" Y/N was now worried, wondering what could be wrong with her friend. "Its because of Spirit." Once again, she was confused. How would Spirit have to do with...then, it struck her.

    It struck her, like lightening stricking a metal pole. Stein was jealous. "Stein...are you jealous?" She needed to ask, just to make sure. "Yes," he mumbled, causing Y/N to shiver, and close her eyes, due to the vibrations he caused. "And, you're mine." Her eyes shot back open, just as Stein pulled away, and brought her over to his desk. He took off his lab coat, threw it onto the floor, and lifted Y/N up onto his desk.

    Y/N watched as he pulled off her clothing, leaving her in just her underwear. Stein peeled off his shirt, tossing it into the pile of clothes on the floor. Spreading open her legs, he brought her body close to his, and nuzzled his face into the space between her neck and shoulder again. Closing his eyes, he enjoyed feeling her bare breasts against his own bare chest. He placed one arm around her, keeping Y/N close to him.

    Y/N, finally snapping out of her shock, wrapped her own arm around the back of his neck. She took in the feeling of Stein placing small kisses, in the same spot on her neck. Once again, she had begun to close her eyes, just to have them open back up. "I think I'm gonna dissect you now." Y/N's eyes rolled, feeling Stein push two fingers into her soaking heat. "I haven't even done anything, yet you're already this wet," he said, smiling against her skin.

    Y/N held in her moans, as he began to thrust his fingers in and out of her core. Using his thumb, Stein rubbed her clitoris, causing a small moan to escape her lips. She spread her legs even more, allowing Stein to push in a third finger. Y/N could feel herself coming close to her release, her whole body starting to have a warm feeling fill it. But, as quickly as that feeling came, it went away.

    Stein pulled his hand away, making Y/N whine. "Why did you stop?" she asked, as he lifted his head up, giving her a smile. "Because, I want you to cum with me fully inside you," he said, causing Y/N's face to start heating up. Pulling off her underwear, she got off the desk, forcing Stein to sit in his chair, and got on her knees. Y/N unbuckled his belt, and with a bit of help from him, she was able to pull down his pants and boxers.

    His member sprung up, hitting his stomach. Taking it into her hand, she slowly began to take in her mouth. As Y/N swirled her tongue around his shaft, Stein threw his head back. This is what he has wanted for years now. During those years, Stein would have multiple dreams of this happening, and having to take care of his morning wood by himself, that all seemed like a faint memory compared to this.

    Stein looked down at Y/N, and he almost felt himself cum at the sight below. She was dragging her tongue up his length, and would suck on the tip, like a lollipop. "That's it," he mumbled, standing up, picking up his lab coat, and spreading it out on his desk. Once again, he lifted her back up onto the desk, but he had an idea before he would fuck her into a different universe. Spreading her legs apart, he lowered himself down to her core, where her arousal was pooling out.

    Smiling at the sight, he placed her legs over his shoulders, and gripped onto her hips. Their eyes connected for a split second, before Stein plunged his tongue into her womanhood. Y/N threw her head back, letting a couple moans spill out, as her fingers became tangled in his hair. Stein began to slow down, glancing up at Y/N. Her whole body was starting to become covered with sweat, with her mouth open slightly, and eyes closed partly.

    Her eyes opened for a second, glancing back down at Stein, his hair covering his eyes. Y/N pushed his hair to the side, having them make eye contact again. Stein stopped what he was doing completely, and stood up, allowing her legs to dangle off the desk. Putting some spit onto her hand, Y/N covered Stein's member completely with her saliva. Stein brought himself close to her, only to have the tip brush lightly against her folds.

    They stared into each others eyes for a moment, before their lips collided with each other. Their bodies pressed together, allowing his member to slip right into her soaked hole. Their lips slipped apart, as Y/N's back arched from the pleasure of being full, and as Stein pulled her even closer to him, filling her with every inch. He kept one arm wrapped around the bottom part of her back, and the other holding them above the desk top.

    Y/N wrapped her arms under his, gripping onto the top of his shoulders, from the back. She wrapped her legs around his waist, allowing him to sink deeper into her. Stein began to thrust his hips back and forth, at a great speed, and not letting himself slow down. He has waited too damn long, to allow himself to go slow. And, he has waited too damn long, to give the woman he loved, an endless amount of pleasure.

    He placed his face back into the crook of her neck, and began to suck on the bare skin, wanting to leave his mark on her. Once he accomplished his goal, Stein moved his arm out from behind her, and had her lay down on her back. And, because of the sight below him  he would've cummed early. Y/had her eyes closed, mouth open partly, allowing moans that she couldn't hold back escape.

    Her breasts bounced with the pace he was thrusting at, and Stein wished he could save this moment. Quickening his thrusts, he gripped one of her hips with one of his hands, and began rubbing her clitoris again, with the other. Whatever moans Y/N was holding back, finally came seeping out. And, it was music to Stein's ears. If her moans were a song, he would press replay again and again.

    The room was filled with moans, sounds of skin against skin, and the smell of sex. Her moans caused Stein to thrust faster into her, pratically slamming in her. Y/N was feeling herself come close to her release, and the need to cum was overwhelming this time. "Stein!" she moaned out, as he felt her walls tighten around him. He put some spit on his fingers, and rubbed her clitoris faster.

    Y/N began to whine, as the need to have her release became stronger, and closer. Her body began to fill with the warm feeling from before. Stein put more spit on his fingers, and rubbed Y/N's clitoris even faster, soon feeling himself come to his own release. Y/N's back arched, the warm feeling exploded through out her body,  as her release coated Stein's member. As Y/N had her release, Stein had his shortly after, filling her core with his seed.

    Her legs were shaking from her amazing release, as Stein pulled out. He smiled watching his semen pool out of her hole, and onto his lab coat. Helping her sit up, Y/N rested against Stein's chest, as they held each other. She wanted to close her eyes, and drift off to sleep, but what Stein said next, had her wide awake.

    "Please marry me."
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A/N: So, I hope you guys enjoyed this OneShot! Once again, of the people who rewuested don't like it, let me know and I'll redo your requests separately.

Should I do a part 2 for this?

Also, sorry for the long wait for an update. My moms birthday was on Saturday, then my birthday was on Sunday (I'm officially 17 now!) and then I had to go visit some family, cause they had gifts for me and my mom. And, then this coming Thursday, I have my permit test to do, so I might not be able to update as much, cause I have to study for it. So, yeah....a lot has happened. Also, I got a living baby duck for my birthday, from my grandpa. (I named it Fred Weasley)

Anyway, next OneShot coming soon!!