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Chapters: 1/1 Fandom: Harry Potter - J. K. Rowling Rating: Explicit Warnings: Underage Sex Relationships: James Potter/Lily Evans Potter, background Sirius Black/Remus Lupin, Remus Lupin & Lily Evans Potter Characters: James Potter, Lily Evans Potter, Sirius Black, Remus Lupin, Peter Pettigrew Additional Tags: body swap!au, Marauders Era (Harry Potter), Angst, Angst with a Happy Ending, Gender Dysphoria, Marauders Halloween Party, Underage Drinking, Underage Smoking, Remus Lupin is a Little Shit, Remus Lupin is a stoner, Marijuana, Smut, Oral Sex, Vaginal Sex, Lily Evans Potter is So Done, Spells Gone Wrong, Anxiety, James Potter is So Whipped, James Potter is a Little Shit, there's some weird gender fuckery in here, but that's okay because it's magic, like 6th or 7th year, Marauders Series: Part 4 of Jily Kinktober 2024 Summary:

In preparation for their annual Halloween Bash, the marauders decide to be eachother for halloween. Spells go wrong and Lily and James end up in each other's bodies.

Featuring: The uncomfortable sensation of living in someone else's skin, remus lupin being a great friend, and alot of lily's inner monologue.

Author’s Note:

A kinktober fic i didn't write until december.

“This is a terrible idea.” Sometimes Lily questions her judgement; usually it's when she’s sitting on her boyfriend's dorm bed surrounded by him and his friends. She’d like to say they’re nothing but pranksters, but they’re actually quite clever in their own ways. The minus side is that they choose to use their intellect to partake in the most extravagant pranks that Hogwarts has ever seen.

Halloween was especially extreme, with the parties and pranks and silly costumes the whole of Gryffindor house participates in. This year in particular they decided to be the ‘real Gryffindor mascots’ for halloween. Eachother.

“You say that about almost everything we do! At least this prank is harmless!” Sirius piped up, ever so excited.

Lily sighed, watching James attempt the modified transfiguration spell that Remus put together. She hadn’t quite decided if she was going to remind them of the existence of Polyjuice potion yet when a wicked crack sounded through the room and she was no longer lounging on a bed looking through the parted curtains, but standing up across from the bed looking straight at Sirius Black’s unruly hair and wide icy blue eyes. What she didn’t notice was that she was looking down at Sirius, not having to tilt her head upwards like she usually would.

Peter’s excited stammer broke through Lily’s racing thoughts, “Did it work?! You guys are being quiet so that means something happened.”

“Evans?” She whirled around on the spot when she heard an eerily familiar voice speak and, and wondered if she made a mistake in not continuing muggle school.

“Tell me this is not happening.” Lily growled, her voice was deeper than it normally was, and for once in this godforsaken castle, something made sense; because this voice wasn’t her own. It belonged to none other than James Fleamont Potter.

“It was supposed to be Sirius! And it wasn’t supposed to swap us, it was supposed to transfigure us!” James sent a pointed look towards Remus.

Lily had never heard her own voice so shrill and agitated.

Finally, someone else spoke; and Lily was so glad it was Remus. He has the least punchable face out of the lot of them. “It was supposed to swap you with whoever you were thinking about James,I didn’t say anything about transfiguration; otherwise we would’ve used Polyjuice,” he said with a sigh, “you shouldn’t be surprised either. I should’ve known you never think about anything but Lily.”

Sirius, ever so helpful, devolved into hysterical laughter at the thought.

“Was the intention to rocket me into James’ body, or was that just a fluke of your ingenious spellwork?” Lily growled out in response.

Remus only smiled that sly smirk of his, unfazed by anything thrown at him. “The intention was for James to transfigure himself into whatever he was thinking about. I tested it before and it worked fine for me, James is just an idiot. He took the ‘into’ part a little too seriously I suppose.”

“Well thanks for that,” James scoffed. “I’m even better than you at transfiguration!”

“Obviously not mate, otherwise you’d look like me and not be shoved inside your lovely girlfriend’s tiny body,” Sirius spoke from the floor, his statement broken up by hiccups and shaky breathing.

“I will not hesitate to curse you, Black.” It was strange to hear James’ voice so rough, especially when she was the one that made it so.

“Shut up Padfoot, Lily’s body is perfect-Don’t insult my lovely Lily’s body! I’ll have you know it’s-”

Lily hoped the glare she sent him was as effective in this body as in her own, as she turned towards her ridiculous.

“Regardless of what you did wrong James, it’ll wear off in a day so you can just wait it out. I’m sure you’ll be fine.”

“Thank you for being the only reasonable person in this bloody room, Remus.” Lily spoke, exasperated.

“I haven’t done anything wrong!” Peter’s interjection caught her by surprise.

Lily sighed, “You’re right Peter, I'm sorry.”

The smallest boy cocked his head. “I think that’s the only time I've ever heard those words come out of that mouth. No offense James.”

James had gotten off the bed at some point and wasn’t standing far from Lily herself. She was trying not to think about the fact that she wasn’t in her own body, but it was pretty tricky when it was standing right in front of you. “I think I'm going to be sick.” Lily sighed, plopping down on the nearest bed and placing her head in her hands with a harsh smack.

“I think we should give them some space, c’mon Sirius.” Remus piped up.

Peter took this opportunity to scurry out of the room and once Remus managed to pull his lover up from his vulnerable position on the dorm room carpet, they were off too. Soon, it was just Lily and James, sitting on the end of Sirius’ bed listening to the sound of the other’s footsteps recede in silence.

“Lily, I am so sorry. I know this is a little bit crazy, but it’s only a day. By this time tomorrow, you’ll be safe and comfortable in your own body. I never meant to drag you into this, especially without your permission.” James said softly, knowing that this isn’t really time to joke. Lily was upset and if there was anything James Potter wouldn’t stand for, it was that.

“It feels wrong. This isn’t my body, this isn’t where I'm supposed to be.” Lily’s voice, James’ voice, wavered with emotion. She still hadn’t looked at James. He couldn’t blame her, it’s really crazy knowing that he’s talking to his girlfriend but seeing himself as though he was looking in some messed up mirror.

“Things are bound to be different. I’ve never been you before, and you’ve never been me before; and if you’re really uncomfortable we can go and knock on McGonagall's door right now. I’m certain she can help us fix it, if that’s what you want.” James sighed.

“What do you mean ‘if that’s what i want,’ why would i want to stay like this.” Lily nearly whimpers.

James treaded carefully. “It could be a good learning experience for us. Walk a mile in each other's shoes, you know?”

Lily took a deep breath and tried to stop herself – himself? – from shedding tears and lifting herself up and straightening her shoulders. “Remus is right, it’s only a day, not worth bothering Professor McGonnogal.” She lifted her head and finally allowed herself to truly take in the reality she would be living in for the next 24 hours, “But we’re still going to keep up in classes. I’m still going to follow my schedule, whether I'm in my own body or not.”

James cocked his head, her head, someone’s head. It doesn't matter, “You don’t want to keep it a secret?”

“Honestly James, this is certainly not the weirdest thing that’s happened at Hogwarts. It’s not even the weirdest thing you’ve caused in this bloody castle. I just want to go about life as normal.” If there was one thing Lily was good at, it was making do with what she had, and so that is what she did. “None of our classmates will even care, which would be quite concerning anywhere but here; regardless, I'll live..”

Classes were strange, but not any stranger than they were the last time the Marauders decided to play some nonsensical prank. Lily went about her business, explaining to each of her professors that she was, in fact, Lily Evans, and not James Potter, despite her appearance. She knew very well that James had the same issue, but she almost couldn’t bring herself to feel bad for him. There was a part of her that was so uncomfortable in her skin that she couldn’t help but to blame James, just a little bit, even though she knew it wasn’t on purpose. Every movement felt as though her sock had rotated just slightly when she left the dorm and didn’t have time to fix it; an agonizing inconvenience, though one that you couldn’t possibly imagine until you’ve experienced it.

Dinner in the great hall was as extravagant as always on the night of All Hallows Eve, though despite the magical significance of the holiday everyone was gorging themselves on themed food and sweets, readying themselves for the absurd amounts of witches-brew and firewhiskey they would be consuming in the coming hours at the Marauders’ infamous Halloween party.

Lily was a little less excited. She didn’t really know what to do with herself in this body. She’d even been avoiding the bathroom because though she had enough experience with James’ biology, she didn’t really know how to use it and, honestly, never planned on finding out.

If it weren’t for James, she would be just fine hiding in her room for the rest of the night. She was a confident woman sure, but this was a lot of attention and pressure even for her. However, she did love James; who seemingly despite their situation, is just as chipper as ever, throwing candy corns in the air for Sirius to catch them with his mouth. He was surprisingly good at it. Remus had his head down and was stuffing his face with everything in sight, it was easy to tell that holiday feasts are Remus’ favorite part of hogwarts.

Lily just focused on eating enough to be full; which, in this body, is a lot more than she’s used to, and moving on with her evening. She wonders what else is different about this body. She learned that because she is still herself in spirit, it’s best for her to use her own wand and not James’, along with her heightened appetite, she also had this restlessness underneath her skin. She had always made comments about James not being to sit still before, now it’s obvious why. It was informative to say the least, just as James had said.

She’s quiet on the way back to the common room, just listening to the noise that comes with hanging around a bunch of teenage boys and the chatter of Mary and Marlene, passively humming responses to anything directed towards her. It isn’t until she makes it back to her dorm room that she realizes that she doesn’t really have anything to wear, seeing as she wasn’t in her own body. (She tried not to think about how the staircase knew it was her and not James, seeing as it didn’t turn into a slide when she approached). She was pretty sure James had the same issue and half wondered if he would try and get her attention for a change of clothes.

She sorts through her schoolwork mainly stalling for time, while the other girls she shared a dorm with get ready, and waits a bit longer before doing anything else herself. She took off her cloak and tie, undoing the top button of her shirt, hoping to look a little more casual.She would feel out of place if she wore her uniform. There wasn’t much else to do, so she rolled up the sleeves for good measure.

Lily had spent most of the day avoiding mirrors like the plague, trying to avoid the pit that appears in her stomach when she becomes painfully aware that she wasn’t in her own body, but she braced herself and headed to the bathroom. She refused to go downstairs not knowing how she looked.

Just picture you’re looking at James, not yourself, Lily thought. She hoped it would work as she opened the door and finally turned to the dreaded piece of reflective glass hanging from the wall. It took some reminding herself not to panic,, but she came to the conclusion that she actually looked rather good. For the sake of feeling less bare, she smudged some kohl around her eyes and turned on her heel, heading downstairs on a mission to have fun; regardless of her physical appearance.

The muffling spell Remus puts around the common room is kind of ingenious, because Lily can’t hear the loud music that’s playing until she passes the bottom step and enters the ‘designated party area.’ Everyone’s wearing silly costumes with their hair spelled into vibrant colors. The smell of overly sugary alcoholic beverages wafted through the air, moved around by the splashing drinks on the dancefloor which is really just the lounge area where the boys had made the couches vanish.

In the corner near the fireplace there was a record player and a single loveseat where Remus charmed the records to change themselves out in whichever order he pleased. Lily decided that was her best option, so she grabbed a cup of witches brew and sauntered her way to sit next to him, hoping she would be able to avoid the majority of the socializing for the night.

“Lily,” Remus greeted enthusiastically. “You got a song request for me?”

She surprised herself with the force in which she landed on the couch, but blamed it on her increased weight and decided not to think about it. “Not right now, but we’ll see as the night goes on.”

Remus only chuckled and raised an eyebrow, “What’s the matter, not looking forward to James drunkenly dancing on a table in your body?”

Lily’s eyes widened. “I hadn’t even thought of that, Merlin help me.”

“I’m only kidding. He has way too much respect for you to do that. He probably will do something stupid eventually, But I doubt he’ll objectify you in the process. He may be a prat but he is definitely a gentleman.”

Lily only rolled her eyes. “I’m just trying to keep a low profile, I don't like not being in my own body. I feel a little guilty because James doesn’t seem to be as affected by it as I am.”

“What do you mean by that?” The taller boy cocked his head.

Lily sighed. “There is something off about it, I can't really put it into words, but it’s tricky to see myself like this and not have some sort of reaction.”

Remus hummed consideringly. “That’s reasonable, but I wouldn’t assume James isn’t as affected as you. He might just be a lot better at hiding it.”

Lily considered this for a moment, then downed her witch's brew.

Remus only laughed. “Let me set up the records, and we can go outside and talk a bit. You seem like you need it, and it’s getting a bit loud in here for me.” He waves his wand towards the floating records, muttering an incantation under his breath.

When he stands, despite every bone in her body— or james’ body— telling her to say that she’s fine, Lily gets up and follows Remus up the stairs and into his dorm.

“I thought we were going outside?” She asked, as Remus opened the door.

“We are.” Remus moved towards the window between his and sirius’ beds and opened, promptly climbing out and sitting on the sloped roof. . He beckoned Lily to follow, before reaching into his pocket and pulling out the worn matchbox he used to store his smokes.

Lily makes her way to the window as well, setting her foot on the sill before asking, “Is it safe.”

Remus selected a spliff from his stash, before placing the box back in his pocket and turning towards Lily. “Safest place in the world,” he drawled.

Lily chucked at his sarcasm and finally followed him out to the ledge, watching him press the tip of his wand to the end of his joint, burning the paper into a glowing ember. He takes a deep pull before speaking on his exhale, “Does it feel very different? Being in another body, that is.”

“Completely. I’ve never experienced feeling so foreign in my skin. I’ve always been comfortable in my own body, but this is different. It’s not my body” Lily basks in the familiar smell of pot and tobacco smoke that comes with hanging out with Remus as she speaks.

“You don’t think James feels the same way.” He flicks ash off the side of the rooftop. Lily wonders if he’s ever dropped it before.

“He certainly doesn’t act like it. He seems just like his normal self, despite the fact that he’s quite literally not himself. I bet he even went to quidditch practice, and I'm going to be sore tomorrow.” She groans.

Remus chuckles and offers the spliff to Lily. Usually she’s not one to partake, but it’s Halloween, she’s at a party, and by Godric was she stressed. It’s James’ lungs anyway. She takes a puff, letting out a string of coughs and handing it back to Remus. She was quiet for a moment, letting the buzz wash over her.

“Here’s the way I see it. You haven’t told James anything about how you feel, matter of fact, you’ve gone out of your way to pretend that everything is perfectly fine.” A pull, an exhale, then Remus continues. “Who’s to say James isn’t thinking the same thing as you right now? Why wouldn’t he think you’re coping so well and put on a brave face? He’s always trying to show off for you, what makes this any different?”

Lily sighed. “You really think so? He’s so naturally good at everything, he has this confidence about him so it’s hard to believe that he’s feeling anything but.”

“Oh trust me, he does have confidence, but that doesn’t mean he feels good about himself all the time,” Remus retorts, “everyone feels like shit sometimes, even James Potter.” He reaches out to hand the joint to Lily once more, and this time she herself is more confident.

She takes a longer pull, and coughs a bit, but the lightness it brings her in the end is worth it. It wasn’t her intention, but despite being so out of place, she’s beginning to feel a bit more comfortable. The power of drugs, she thinks to herself, Petunia would have a fit if she knew. That made her giggle.

She looked over to see Remus smiling, then gasped. “Oh you prick! You knew this would work!”

He only laughed t and reached out for the spliff again. “I had an inkling. I know a thing or two about not feeling at home in your own skin.”

They sat there on the roof for a while, just long enough to finish the joint, before returning to the party with a new fervor. Both of them were much more willing to be social in the party environment now that they were just the right level of intoxicated. Remus promptly returned to his DJ station and changed the record with an exclamation, “whoever even put this record in my library is going to be transfigured into a toad by the end of the night, mark my words.” He knew full well it was Sirius, but that doesn’t make his threat any less..

Lily however, barely made it past the muffling spell before she was confronted with her own body and high pitched voice. “Evans!” Arms wrapped around her, and she never realized how short she was — or how tall James was — until now.

She couldn’t help but smile. “Hello James.” He had pulled his ginger hair back from his face in a sleek ponytail that she was sure Sirius had to show him how to do, smelling suspiciously of sleekeazy, and he also still wore his school uniform. Only he had lost the stockings, tie, and cloak, and untucked the shirt. It looks as though great minds think alike.

James wrinkled his nose, “You’ve been hanging out with Moony,” he sniffed. “Don’t tell me you’ve been contaminating my lungs with that awful smoke of his?”

Lily only laughed. “Only if you don’t tell me about the sheer amount of firewhiskey that you’re about to drink tonight.”

There was a mischievous glint in his eyes. “You’ve got yourself a deal, my lovely Ms. Evans.”

Finally, both James and Lily were able to enjoy the party. Lily dances much better than James ever could in his tall lanky body, James absolutely disregarding the grace that comes with Lily’s petite form and childhood dance lessons.

Soon enough they were no longer capable of keeping their hands to themselves, so they stumbled their way up to James’ dorm, the only one that was sure to let the both of them in. Soon enough they were falling over each other onto James’ bed.

“Do you want to know what it feels like?” James asks Lily, voice breathless and lips swollen raw. There was a weird sort of cognitive dissonance that came with finding yourself attractive in that way. Lily archived that thought for later.

“What, what feels like?” Lily panted.

James took that as an opportunity to slide off the bed and onto his knees in front of Lily, dragging his hands upwards slowly until they pressed on the insistent bulge in Lily’s trousers.

Lily had to take a moment to pause. She had tried her hardest not to think about her new genitalia, and grew aware of the pressure that had arisen beneath the fabric. She felt as though she should be scared, but the arousal that coursed through her veins had different plans, so she nodded.

James' hands flew to her zipper and Lily lifted her hips to help him slide her trousers down her legs before he unceremoniously tossed them on the floor elsewhere in the room.

Only once her aching member was freed from its cloth prison did Lily realize just how insistent it had been. James wasted no time in wrapping his hand around it, the warmth and comfort of his hand turning into red hot pleasure, spreading farther under her skin as he stroked. She let out a strangled moan and tried her hardest not to buck her hips, allowing James to set the rhythm.

“How does that feel,Lily?” James was breathless, his face flushed. Lily could barely notice his other hand, which lingered suspiciously close to the apex of his thighs.

Lily had to stop herself from whimpering, squeezing her eyes tightly shut. “So good James, so good-” The sensation was so overwhelming, nearly tickling when he twisted his palm over the tip, passing over the foreskin; and a deep radiating pleasure when he squeezed the shaft. He knew exactly what to do to make her come apart, it was his cock after all.

Lily was so lost in the pleasure that she was caught completely off guard when she felt it. James’ lips had formed a seal around the head, flicking at it with his tongue for a moment before sucking long and hard. Lily couldn’t help but moan out loud.

James pulled off for a moment, only to murmur a rushed sonoro quiescis, before taking her back into his mouth and this time he went much farther. He pressed down until the tip pressed against the back of his throat. Lily was lost, she could feel herself twitching in the warmth of him but couldn’t hear her own moans. He bobbed his head, just barely testing the limits of his gag reflex, letting out little hums of pleasure when she touched the back of his throat. The pressure in her veins was so close to releasing when James pulled off of her with a loud ‘pop.’

Lily whined at the loss, only to be pushed down onto the bed unceremoniously. James straddled her, pressing his lips to her own. She could taste herself on him, and it was doing something to her mind that she didn’t understand. She dug her hands into his hair and rolled her hips against him, and they moaned in unison.

She could feel the wetness seeping through James’ panties as she pressed into him and that only spurred her on. She reached down and pushed the fabric to the side, gliding her fingers through his folds before finally settling on his clit. She teased it for a moment and let out a grin when she felt his hips stutter, before dipping the tip of her finger inside.

It was James’ turn to moan. “No please, I want you inside me. All of you.” He pushed up so that he was upright, straddling Lily’s hips, before unceremoniously dropping himself onto her length with a shout. Lily groaned. If his mouth was so hot and wet it had her nearly cumming in just minutes, then this was pure bliss.

She was about to grab him by the hips and thrust up into him at her own pace, but it turned out she didn’t need to. Just as she reached out for him James ground his hips in slow, agonizing circles. Lily was losing control. She couldn’t last long like this. She tried her hardest to let him have the control; But basking in the warmth of James’ pussy wrapped around her cock, was something entirely different from anything she’d experienced before.

Lily busied herself with watching James’ pleasured expression twisting the face that really did belong to her, while she worked through the buttons on his shirt. . There was something so intimate about it, sharing every inch of yourself with another person, from the inside out. They moved in rhythm now, Lily’s hips moving in time with James’ as she pushed the thin white fabric off his shoulders. There was a weird sort of cognitive dissonance that comes with undressing your boyfriend to see your tits in your bra, but it was still so hot that Lily wasted no time in removing the offending garment and latching his nipple.

James moaned loudly, his hips stuttering on Lily’s cock, but she didn’t stop moving. She flicked her tongue against his nipples with her hands braced on his hips, pulling him down to meet each stroke with force. Watching him bounce on top of her, whimpering each time she hit that delicious sweet spot inside of him, only spurred her on.

Soon, they were already both so breathless and so close to the edge, that when James’ dared to lift himself up his legs shook and he all but speared himself on her length with a loud cry. Lily took the opportunity to thread her fingers through his hair, ignoring the carefully placed product and bobby pins holding it together, and brought their lips together. There was nothing gentile about it, it was lips and teeth and tongue, and every bit of emotion they could pour into each other. They licked into each other's mouths and nipped at each other's lips, leaving trails of saliva behind.

Soon Lily found herself hovering over James, leaving purple bruises on every inch of the porcelain skin he wore, desperately grinding against his wetness. James let out a pitiful groan when the tip caught against his clit, and Lily always made sure to lean up and capture the noise herself; in between nips and kisses at his neck, shoulders, collarbones, ribs, making Jame’s blood burn beneath his skin as she passed.

James’ hips bucked upwards when Lily sucked a deep purple mark on his hip bone, only resulting in Lily using her newfound strength to pin his hips to the bed. She peppered small kisses on each hip, to the trail of golden pubic hairs that led down to his core. She looked up at James, wearing his signature confident smirk, before licking a long stripe from the bottom of his entrance all the way up to his throbbing clit. She did this again, slowly, only to suck on the little bundle of nerves hard enough to make him shriek. That moan alone was enough to encourage Lily to dive in, regardless of oxygen levels. She laved her tongue over his entrance in smooth yet quick motions, pointing it to flick at his clit. Soon enough James’ hands would tangle in her hair and press her into him, surrounding her in his scent. Lily’s motions lost all rhyme or reason, she only followed her lover’s moans until his thighs were squeezing her head and she could no longer hold him down.

Lily took advantage of James’ vulnerable state and flipped him over to his stomach, landing a soft slap on his plush flesh, resulting in a yelp. “Lift your hips for me?” Lily asked, her voice soft in contrast to her recent behavior. She found it hard to control herself, chasing a type of pleasure she had never felt before. If you asked her about it beforehand, she probably would have been terrified; but if there was anyone she was willing to be this vulnerable with, mentally and physically, it was James. And she understood that he felt the same way. So when he lifted his hips up, arching his back on all fours, Lily’s new lips formed a grin.

She could see his glistening folds and yearned to put her cock inside. She allowed her spit to drip down onto his slit, watching James flinch at the new wetness, before teasing him with her fingers. She breathed in each small whimper and moan that fell from James’ lips, stroking herself with her other hand. When the sounds grew more insistent, whimpers becoming louder whines and moans becoming shouts, she slid inside.

Both were feverish with desire, James pushing back with just as much force as Lily drove forward, grunting with each impact. “I’m so close James-” Lily spoke breathlessly.

James moaned loudly, “fuck, please cum with me, please.”

It was only a moment before James got his wish,swearing and moaning as he clenched around Lily, shooting her release deep inside him. Their quick pace slowed, as they rode out their pleasure, grinding slowly into one another, to the brink of overstimulation.

James was the first one to speak, after Lily pulled out and they lay on the bed, covered in their own filth, too intoxicated and tired and in love to do anything more. “I told you it could be a learning experience.”

Lily couldn’t help but smile

#James poter #lily evans potter #marauders #fanfiction #fanfic #stoner remus #angst #fluff #smut #greyfix

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