All the characters in this story are 18+
This is a sub Neville x reader
You were walking down the hall late at night when you heard you heard yelling and crying. You over to where it was coming from and see two guys kicking and calling the guy names when you looked closer you saw the guy was Neville your secret crush since first year. “AYE!” You shouted and the two boys turned to look at you. You were known for getting into fights and being respected or feared. Everyone did everything you said. “What do you shitheads think you’re doing?” “We’re beating this idi-” “Shut up. Knees now” they immediately followed your orders. “Neville stand up.” He stands wincing in pain. “Now I want you two to apologize” “Bu-“ “Now” They apologize and you tell them to get out your face and that they’re not allowed to mess with Neville again. Neville is still standing there not making eye contact. “Come on let’s get you cleaned up.” He follows you to your dorm,single because being rich and dangerous has its perks. “Sit” you say pointing to the bed as you go into the bathroom for the first aid kit. You make your way over to him kneeling between his legs grabbing his face making him look at you. “You shouldn’t let them treat you like that,not that they still will but still.” He doesn’t say anything just looks to the side avoiding eye contact. You proceed with cleaning up his wounds. After you’re finished you go put back the kit and when you come back Neville is standing up in the middle of the room. “Thanks” he says looking down. “That’s not a very appreciative thanks. I think you’re going to have to do something for me.” He finally looks up and hesitantly says “O-of course, what is it?” “Do you have plans right now?” He shakes his head no and you smirk.
20 minutes later 
“Alright I’m ready now let’s go” you say walking out of your bathroom wearing a black bodycon dress. Neville looks at you wide eyed and looks down blushing.
Walking through the halls Neville speaks up and asks “Can I ask where we’re going?” “You’ll see when we get there,don’t worry love.” He blush’s at the name and stays quiet. You reach Theo’s dorm and step inside the Slytherin’s party “I don’t think I can be here” Neville says worried “One thing you need to remember love, is that you can be anywhere when you’re me” you wink at him while saying this proudly. You both walk over to Theo and the group. “ HEYYY ITS Y/N” “Toned it down dude.” “Sorry” says Theo. Draco and Blaise stand up to say hello and make room for you. No one questions Neville’s presence. Time goes by and you sneakily place you hand on Neville thigh when you’re passed a drink. You could hear when his breath hitched and you smirked. “ Let’s play truth or dare” Draco says. Everyone starts playing and Blaise says “Y/N I dare you to sit on Neville’s lap.” He said with a smile. Blaise was the only person who knew about your crush on Neville and he wasn’t about pass up the chance to force you to make a move. “With pleasure” you say while flashing a fake smile at him. You sit on Neville’s lap and you could hear his breathing and his hands were gripping the couch trying his best not to touch you. “ You comfortable,love?” You whispered in his ear. He nods eagerly. Thorough out the night you tease him by moving and grinding a lot “try to get comfortable”. If wasn’t until you shifted to hard that you heard him whimper. You smirked and did it again. “Y/N please” he whispered. By now everyone is doing their own thing either dancing or making out or off doing god knows what. You and Neville were the only ones on the couch. “What do you want me to do love?” He shifted his hips at the name, you could feel that he was fully hard now under you. “Can we please go back to your dorm, I mean not that I think we’re going to do anything, I could just go to my dorm and take care of it myself” you cut him off by kissing him. Now you’re making out and you’re straddling him pressing slightly against his hard on. He lets out an airy moan when you start grinding on him. “You look so pretty like this nev” you say while kissing down his neck. “ Please please I really need this” you ignore him and keep kissing his neck. He starts buckling his hips “No no, good boys don’t do that” “I’m sorry I just-Y/N please I need more” “No complaining.” You stay like that for a couple more minutes. You stopped and Neville whimpers saying “No please” “I’m giving you what you want, stop being a brat.”
You go to your dorm Neville following behind you holding your hand. “ Lay down pants off” he does this quickly. You start undressing in front of him slowly, you see him start to palm himself through his boxers “ Nah ah no touching unless I allow you.” Neville quickly stops and grips the bedsheets. You crawl over to him just in your underwear and straddling him. He grunts and try’s not to buckle his hips. “You’re such a good boy,aren’t you Neville” he eagerly nods while you start grinding, “Please no more teasing” he moans out. “ Beg for it” you say while you slow your grinding to barely give him friction, “ Please, please I really want, I need it” he say nearly crying “Such a pretty boy, well since you asked so nicely.” You slide down his boxers and start stroking him, sucking on the tip “Aah more! Please!” You take him in fully in your mouth, He thrusted his hips up into your mouth and you pull off “ No no please I’m sorry I didn’t mean to it just felt really good.” Neville says crying “ Shh it’s ok baby it’s ok I’m just going to take off my underwear” he sighs and watches as you take them off. “ I’m on the pill and clean but if you want we can still use a condom.” “ I’m clean, while I have never done anything but-“ you kiss him and run his tip up and down your pussy. After you ask him if he wants this and he says yes, you put it in and you both moan. You stay still let him get used to it.” Please move” you start going back and forth and you see him gripping the sheets so you grab his hands and put one on your waist and the other on your breast. He looked at you confused and clueless “ Squeeze them” you moan. He starts squeezing and playing with them “ Can I put them in my mouth?” He asks “ Please” you say. You speed up and Neville is moaning against your boob. “I’m going to cum, please can I cum.” “ A little more baby, can you hold on for a little bit more for me?” He nods moaning a couple more thrusts and he whimpers “I cant!” He cums “I’M SORRY IT FELT TO GOOD PLEASE FORGIVE ME!” “Shhhh it’s ok baby, you were such a good boy for you first time.” You get off of him, and clean up “ What about you?” he says “What about me baby?” “You didn’t cum.” “It’s ok, this was about your pleasure.” “But your pleasure is my pleasure, what can I do, please show me how to please you.” “ Really it’s ok, but if you want you could finger me, I’ll guide you.
“ Fuckk, youre doing so good baby. Such a good boy.” You and Neville are cuddling while he fingers you. You could feel Neville grinding against your thigh but you didn’t say anything about it, “ I’m close, fuck you’re so good at this.” You didn’t know your words and moans made him hard again and now he’s going to cum on your thigh. You heard his whimpers but were too busy in your own pleasure. “ I’m cumming!” You both moan and you cum on his fingers and he cums on your thigh. “ You seemed to like that as much as I did” you smirked at Neville “I’m sorry it’s just the noises you were making” “Don’t apologize just clean it up.” He cleans up and you guys cuddled and fall asleep not without saying “You know this isn’t a one time thing, you’re my boyfriend now.” “Really? I mean of course I want to but why would you want -“ you kiss him and say good night, he cuddles into your chest and you both fall asleep.