Neighbor

                                    

                                          
What to know before reading: These Imagines will usually contain mature content, so please be cautious. All characters will always be depicted at a legal (18 ) age, regardless before or post timeskip. Point of view will be in third person unless stated otherwise. Mistress/Missy, if ever included in these imagines, is my own character and is not part of the Fire Emblem franchise. Anything that doesn't sound familiar to FE3H is most likely made up; you will be able to tell if it is. There will also probably be spoilers, so if you haven't played all 4 houses, you've been warned. One extra note, some things might not belong technology-wise, and other stuff might not be canon, but please just go with it, or you can think of this as a reality AU where they're all in college and Byleth is still their professor. This isn't an AU, but if it really bugs you that much then go ahead and imagine it as such. Enjoy reading.
Imagine: The biggest flirt in Fódlan is now whipped over the newest professor. One unrestricted night changes everything. F!Byleth.
Warning: Rated R, and at one point probably a little shamelessly rated R, depending on your tastes. And this one is a long one, probably more of a one shot at this point because fuck. It's Sylvain. 
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"Sylvain?" 
Sylvain blinks, breaking out of his daydream as he follows the voice that called out to him, seeing a concerned looking Ashe. He looked at the time. Class was nearly over. Last he remembered, class just started. How long had he been daydreaming? "Uh yeah Ashe? What is it?" He answers dryly, still trying to figure out how long he was in a daze for. "I just wanted to make sure you were okay. You've kinda been staring at the professor for quite a long time now." Felix scoffs from a seat just behind Sylvain, shaking his head as he closes his book, the bells ringing just a second afterwards. "Why is that anything new? He always stares at the pretty women on campus. Our professor isn't going to be excluded from that list." He snaps before walking out. 
Sylvain rolls his eyes towards Felix's attitude before smiling gently towards Ashe. "I'm fine, don't worry." Ashe returns the smile and nods before packing his own things up and walking out of the class as well. Sylvain starts to pack his own things up only to be interrupted as Byleth places a blank paper in front of him and sits next to him, after all the students have left already. "Sylvain, do you have a moment to talk?" It has only been a month since she arrived at the school, so she tried to sound as courteous as possible to not come off as intimidating. She hasn't realized it wasn't really necessary yet. 
"For a pretty lady like you? You have all of my time, professor." He flirts, gaining a small smile before she returns to her neutral composure as she flips the paper over, revealing his grade from his last test. "You didn't do too well on our last test. This is the third test in the row where you haven't done well. I was worried that there might be something wrong?" She places a hand on his in concern, throwing him off his usual confidence. Sylvain scratches the back of his head, smiling awkwardly. "Aha, oh that. Nothing is wrong! I just am not very good at tests is all." The professor angles her head a little in a small tilt, observing him and analyzing his answer. "I see. Would you like me to help you with some test taking skills? I know a few that could help your grade up to a C, at least." 
Sylvain laughs nervously, shaking his head. "Oh, as much as I would love to spend all of my free time with you professor, I don't think it'll be necessary. I just need to spend a little more time studying, I'm sure." Byleth purses her lips in obvious disbelief but sighs, standing and removing her hand from his. "Very well. But I have been notified that if you aren't able to raise your grade to at least a C, you will have to be in mandatory tutoring sessions with me after class." She packs her own stuff up as she walks towards the door before stopping in her tracks at the doorway, not looking back at him. "Manuela tells me you've been bringing girls to your room every other night." She pauses, Sylvain tensing as he lowered his head a little in guilt. Ah shit, I've been caught. She doesn't finish her sentence and instead continues walking out, leaving his sights. He raised his eyebrows, severely confused. No reprimand? Odd. He ignores it for the time being however and finishes packing up before heading back to his dorm. He hoped this attention he was receiving from her wasn't going to be a regular thing. It certainly wasn't the kind of attention he wanted.