Requested by ghostwriter3456: Y/N and Peter are dating, and one night, he's fighting one of his known enemies when the enemy turns him into a girl. Y/N and Peter can't figure out how to change him back, so they have to start navigating their relationship with him as a girl, as well as Y/N teaching him things like how to deal with being catcalled, periods and sex as a girl.

Peter and I sat on his sofa, my head and hand on his chest, and his arm around my waist holding me into his body as we cuddled and watched a movie.

"Why the fuck are they kissing in the rain? They're right outside of her house, and yet they've chosen to get soaked in the rain." Peter chuckled and shook his head.

"You're the biggest hopeless romantic that I know, Pete, do you not see what's romantic about kissing in the rain?" I scoffed as I looked up at him.

"I think that it's very romantic, baby, but I'd much rather kiss you in a dry place, like my living room. Where that kissing can lead to more." He nodded as he returned the glance. I raised my eyebrows, my mouth curling into a smirk as his eyes flicked between my lips and my eyes.

"What more are you thinking of, Parker?" I teased as he started to lean in.

"How about I show you?" He flirted, making me giggle as he leant in and kissed me. I returned it, a squeal leaving my lips as he immediately moved us so that he could pin me to the sofa as he gently lay me down and crawled over me. Peter and I had been dating since the first year of high school, and our relationship was nothing short of perfect. Peter and I had been through a lot together, I had been there when Peter had gotten bitten by a radioactive spider and had become Spider-Man, and then when his uncle Ben had been killed in a home invasion. We'd been through it all together, convincing us that we were together for life. And that made me happier than anything. Peter deepened the kiss, making me smirk into it and pull him closer as I raised my legs and wrapped them around his waist.

"Fuck, shit." He mumbled suddenly as he broke the kiss and pulled away, making my eyes widen.

"What's wrong?" I gulped as he sat up.

"My Spidey senses are going crazy, something's really wrong." He shook his head, making my eyes widen further as he shot up from the sofa.

"Can you tell what it is?" I asked as I followed him into his bedroom.

"No, but it's big. Really fucking big." He nodded. I gulped and sighed as I watched him start to get undressed and get into his suit. What Peter did was amazing, and I couldn't have been more proud of him, but I always got worried to death every time that he had to go on a mission. After all, I always tended to the after-effects, so I'd seen Peter extremely cut up and close to death on multiple occasions. Though, I knew that he had to do it, and so I'd support him.

"Be safe, okay? Look after yourself." I sighed as Peter's suit tightened around his body.

"I always do, baby, you know that. I'm sorry about this, but I'll be back as soon as I can." He nodded.

"Just come back to me alive, that's always enough for me." I reassured.

"God, I love you." He smiled, making me return it as he leant down and kissed me. I returned it, my hands holding his face as I tried to memorise what his lips felt like against mine like I always did before he went on a mission. After all, as much as it broke me, I never knew if each time would be the last, and so I never wanted to waste the moment or take it for granted. He broke the kiss and looked at me.

"I love you too." I whispered. He smiled and pecked my lips once more before heading to his window. He looked back at me.

"As usual, you're welcome to stay here, but see yourself out if not. I'll see you later, baby." He nodded before heading out of the window and disappearing into the dark. I sighed and bit my lip, my heart full of worry like it always was at him doing what he did best, as I turned and headed back into the living room to grab my stuff and go home.

Peter's P.O.V

Peter jumped from wall to wall of the alleyway that he was trapped in, Mysterio's drones firing at him as the supervillain tried to take him down. Peter had known the second that his Spidey senses had started to go off that whatever was setting them off was big. And he had been right. Currently, he was trying his hardest not to get killed by his old enemy, his old enemy that seemed to have had many upgrades since they'd last fought. Meaning that Peter was losing. Badly. Peter cried out, one of the bullets grazing him, catching him off-guard and making him fall to the ground. He groaned and held his side, his eyes squeezing shut underneath his mask as he rolled onto his hands and knees. He panted and looked up at Mysterio.

"What do you want?" He spat.

"I want you to suffer, Pete. I want everything that you love to be taken away. Starting with your relationship with Y/N." He smirked. Peter's eyes widened.

"NO!" Mysterio raised his hands and fired his unknown energy at Peter, making the boy yell out as he got thrown back to the ground. The energy stopped after only a second, but it had hit him perfectly. And had put him in more pain than he'd ever felt before in his life.

"W-what the fuck did y-you just do to me?" Peter choked, his body feeling like it had been hit with a million volts of pure electricity as his fists clenched and his back arched off of the concrete.

"You'll see soon enough, Pete. Have fun with your new life." the supervillain smirked before flying off and leaving Peter alone once more. He choked and squeezed his eyes shut, his mouth hanging open as the pain continued to seize through his body. He had no idea what Mysterio had done to him, or if he'd even survive it, but he had to get to Y/N. And he had to get to her now.

Y/N's P.O.V

My eyes fluttered open, my body being pulled out of sleep. I raised my head and looked around my room with furrowed eyebrows, my mind confused as to what had woken me up. Until I looked out of my window. My eyes widened, a gasp leaving my lips as a very injured and maskless Peter was resting against the outside of the pane, his head and body against the glass as his eyes fought to stay open.

"Oh my god, no." I choked as I shot up out of bed and to the window. I opened it and yelped out as Peter's body fell straight into my room.

"Fuck." I puffed out, my arms trying to catch him, but him being heavier than me meant that I fell to the floor with him.

"B-baby...h-h-help." He stuttered as his body shook and sweated uncontrollably.

"It's okay, I have you, you're okay." I choked, though tears started to leave my eyes and my heart raced in my chest. This was the worst-case scenario, bard Peter actually dying. After all, I had no idea what was wrong with him, and therefore no idea how to help. I wrapped my arm around his waist and lifted him up, his weight almost crushing me as I just about managed to get him lying down on my bed.

"What happened?" I gulped as I slammed my hand against the spider on his chest to make the spandex loosen around his body.

"I-i-it was Mysterio, which is why my S-spidey senses were going so crazy. H-he had more tech, m-more abilities, he fired something at me." He choked, a thin layer of sweat coating his body as I pulled his suit off to leave him in his boxers. My eyebrows furrowed as I saw not a single cut on his body, the only slight marking being what looked to be a bullet graze on his side. But that was nowhere near enough to justify the amount of pain that he was in and why he was shaking and sweating so much. Something else was going on, the issue was that I had no idea what. I gulped and looked at him.

"Peter, you...you have no physical injuries...I don't know what to do to help." I shook my head.

"N-no...neither do I...I don't know w-what he fired at me." He shuddered. My face dropped, my heart plummeting to my feet as I realised why he'd come to me. My eyes wavered as I looked back at him.

"You didn't come here for me to help, because you knew that I couldn't. You came here so that you're with me...in case whatever he did to you...kills you." I choked. He gulped harshly, his eyes also becoming glassy as he looked at me.

"I-I-I don't know what he hit me with, b-but whatever it is, I'm in s-so much pain. I don't know if I'll survive this. S-so, yes, I came to you to b-be with you in case this kills me...n-not for you to help." He shook his head. I choked, tears leaving my eyes as I grabbed my desk chair and put it next to the bed before sitting down on it next to him. I tightly took his hand into mine, Peter's grip weak in return. But I could tell that he was trying.

"I'm not going to leave your side. You're not going to die, and I'm going to make sure of it. I'm not leaving your side until I know that you're okay." I choked and shook my head, tears leaving my eyes as I raised his hand and pressed my lips to it. He gulped and looked at me.

"I-if I do...you know...t-tell May that I love her...and fuck, I-I love you. I love you so fucking much." He whispered and shook his head. I bit my lip harshly, Peter's quieter voice and fluttering eyes telling me that he was close to falling unconscious. And I was fucking terrified that once he went to sleep, he wouldn't wake back up again.

"You're going to tell her yourself, because you're going to be okay. I love you too, though. You're my life, Peter, so you wake back up again after you fall asleep, okay?" I nodded as tears streamed down my face. He gave me a weak smile, his grip on my hand also getting weaker as his eyes fought to stay open.

"I'll try, baby. I'll try." He whispered before his eyes fluttered shut and his hand went limp in mine. I choked and bit my lip, my heart feeling numb at the idea that this was it. That he may not wake up again. After all, neither of us had any clue what Mysterio had done to Peter, and so right now, it was a guessing game.

"I love you, Pete. I love you so much." I choked as I gently cupped his cheek and pressed my lips to his other cheek, my hand staying against his face as I stayed by his side.

My eyes fluttered open, my body slowly but surely coming out of sleep as sunlight flooded into my room. I groaned as I raised my head from the side of my bed, my neck and body feeling so fucking stiff from having fallen asleep on my chair instead of in my bed as I sat up. I yawned and stretched out before peeling my eyes back open and landing them on Peter. My eyes widened.

"OH MY GOD!" I screamed as I shot up from the chair and away from the bed as I raised my hands to my mouth.

"Woah, what the fuck is up with the screaming?" Peter groaned in a higher-pitched voice than he had yesterday as he squeezed his eyes shut and raised his hands to rub over his face. Except for that...it wasn't really Peter. Or it was, and he had changed...but...how?

"P-peter?" I gulped, making my boyfriend look at me.

"Yeah? What's wrong?" he mumbled as he looked at me with furrowed eyebrows. I gulped harshly again, my heart racing as I looked at him.

"Are you feeling okay?" I checked. His eyebrows furrowed more, the boy clearly confused as to why I was asking these questions. But, I had my reasons.

"Yeah, I'm feeling fine, definitely better than I was last night. Why, baby? What's wrong?" He scoffed as he propped himself up on his elbows. I bit my lip and looked at him.

"How, um...how about you go and look in my mirror?" I nodded. My boyfriend looked at me with even more confusion as he sat up, making me gulp and try not to look at his body.

"Why-."

"Just do it." I nodded again. He sighed and shook his head, making me gulp as he stood up and headed to my door to look in the full-length mirror. I bit my lip, my heart racing as I was completely unsure of what he'd think when he saw whatever it was that Mysterio had done to him. He moved to the mirror, his eyes immediately widening as he saw his reflection.

"WHAT THE FUCK?!" He yelled, making me sigh and nod as we both looked at his body in the mirror. The body that now...was a woman's body. Peter stood in the mirror, his short curls pretty much all that were left of his male body. His face was slightly more slender and long, his lips slightly fuller so that in general, he looked more feminine. His pecs had developed into breasts, his muscles still there but now sitting in between hips and curves that looked more like a feminine body than a male body. Not to mention how considerably higher his voice now was when he spoke. Whatever Mysterio had done to my boyfriend...had turned my boyfriend...into my girlfriend.

"Oh my god...babe, I have a woman's body, oh my god." Peter scoffed, his eyes wide as he moved around in the mirror to look at his new body from all angles.

"Yeah...yeah, you do." I nodded as I tried not to laugh. But he noticed. His eyes widened further, and he turned to look at me.

"Angel, are you...are you trying not to laugh?!" he exclaimed.

"I'm sorry, Pete, I am, but out of all things that Mysterio could have done to you, he turned you into a woman? You've got to admit that that's a new one." I chuckled and shook my head.

"Yeah, it is, and one that I don't like! How do I fix this?! I've lived as a guy for the last eighteen years, I don't know how to be a woman." He scoffed.

"And that's why it's good that you have such an understanding and liberal girlfriend." I nodded. He looked at me.

"Baby, I don't know how to fix this. I don't know how to go back to being a guy, so as much as it'll kill me...I get it if you don't stick around." He choked and shook his head. I sighed and returned his look.

"You're lucky that I'm bisexual." I nodded. His lips broke into a smile, a tear leaving his eyes as he chuckled and shook his head. I smiled and bit my lip, my mind already trying to figure out how the fuck we were going to do this, how we were going to explain this, but that didn't matter right now. All I knew right now was that I had to be there for Peter. And so that was exactly what I'd do.

~One month later~

"Okay, so, you push this up like that, and that'll go inside of you, whilst you pull that bit out. Does that make sense?" I asked as Peter and I sat on my bed. Or rather, I sat on my bed with Penny.

"I think so. I need one anyway, so may as well go and try it, right?" She chuckled and shook her head.

"Here's a fresh one. Let me know if you need any help, okay?" I checked as I handed her a still sealed one.

"Thanks, baby." She nodded and leant forward to peck my lips before standing up. I sighed and followed her with my gaze as she headed out of my bedroom and to my bathroom. It had been a month since Peter had been turned into a girl by Mysterio and things had been interesting. As far as we were both aware, there was no way to turn him back, and so May and I had started to prepare him for life as a woman. Hopefully, he wouldn't have to stay like this for all of that time, but we were preparing for the worst. He had taken the name of 'Penny', and we had created the story that 'Peter' had had to go away for a while as part of his internship at Stark Industries, whilst his cousin 'Penny' came to stay instead. It was a shitty, half-baked story to explain to everyone who couldn't know that Peter was 'Spider-Man' and therefore how he'd ended up in this situation, but it was better than exposing him to everyone who couldn't know. Since then, Penny and I had stayed together, and I'd been teaching her how to navigate life as a woman, including things like how to handle catcalling. Two days ago, Penny had gotten her first period, meaning that Mysterio hadn't just changed Peter's body on the outside, but his autonomy within. And so, I was currently teaching her how to use a tampon. I looked up as she walked back into my room, making me raise my eyebrows at her.

"Did you get on okay?" I asked cautiously.

"Y-yeah, I think so...I'm still very new to having a vagina, so I'm still not one-hundred-percent sure how one works." She chuckled nervously.

"Please, Pen, you know your way around a vagina, you know your way around mine well enough, anyway." I smirked, making her return it and shake her head.

"Okay, but knowing how to please my girlfriend and knowing my own, month-old vagina are two very different things." She scoffed.

"I'm sure that you did fine. Can you feel it?" I asked. She paused, her eyebrows furrowing slightly.

"...no...I don't think so. Why, is that bad?" She gulped.

"No, no, you're not meant to be able to feel it, that's a good thing." I chuckled as I stood up. She sighed and looked at me, making me give her a small smile as I curled my arms around her waist.

"You're doing really well, you know. I know that being a girl is very new to you, but you're doing great. It may not feel like it, but I promise that you are." I reassured. She sighed and returned my smile.

"Thank you, babe. It means the world that you're helping me." She nodded.

"Of course. If we could navigate your uncle dying and you becoming 'Spider-Man', we could navigate you being turned into a woman." I teased. She chuckled and shook her head at me.

"What did I deserve to get someone as amazing as you?" She smiled.

"You're just a good person, Pen. It's as simple as that." I reassured. Her smile widened, making me return it as she leant in and kissed me.

Penny and I sat on my bed, our lips joined as we made out. I raised my hand to her face, her not having lost her dominant streak that she'd had as Peter as she slipped her tongue into my mouth.

"This is meant to be about me showing you sex, remember?" I cooed as I broke the kiss and moved my lips down to her neck.

"Right, sorry, I'll let you take over." She chuckled, making me smirk into her neck as I started to leave open-mouthed and nippy kisses on her skin. I gently pushed her down onto my bed, my legs straddling her waist as I raised my head and captured her lips again as we started to make out. This was another thing that I needed to teach Peter as a girl. And that was sex. But this one, I was really looking forward to.

"Let me take control, yeah? You may know your way around me, but you don't know what sex feels like as a girl." I flirted. She let out a quiet moan at my words, making me smirk and let my confidence shoot up at her reaction as I continued to kiss down her body.

Penny and I lay next to each other in my bed, our naked bodies wrapped in my sheets as we stared up at my ceiling.

"Wow. That was...incredible." She scoffed and shook her head. I smirked and bit my lip as I turned my head to look at her.

"Now you know how it felt when you used to go down on me." I flirted. She chuckled and rolled onto her side to look at me, making me bite my lip as my gaze flicked over her face.

"You know, I'll never be able to thank you enough for sticking by me. I'd have completely understood it if you'd left when Mysterio did this to me, so it means a lot that you stuck around." She nodded. I gave her a small smile and also rolled onto my side to look at her as I raised my hand to gently cup her face.

"Of course, Pen. Look, I love you. I loved you within six months of us first dating. So whilst, yes, it was a big adjustment you being turned into a girl, I wasn't going to turn my back on you for that. I love you. And that'll never change, regardless of your gender." I reassured. She gave me a small smile, making me return it as we gently stroked each other's cheeks.

"And I love you for that, baby. Even if Mr. Stark doesn't figure out how to turn me back, I have comfort knowing that I'll never lose you." She nodded.

"Never." I shook my head before leaning in and kissing her. She returned it, our hands cupping each other's faces as we let ourselves sink into the intimate moment. I broke the kiss and touched our foreheads, my eyes fluttering open to look into her chocolate ones.

"I love you, baby." She mumbled gently.

"I love you too." I whispered, making her smile and kiss me again. I may have lost Peter for Penny on that day, but that didn't matter to me. After all, she was still my Peter, just in a different body and with a different name. She still loved me to the ends of this earth, and I loved her just as much. And that ultimately, was all that mattered. Even if I never had Peter again, I had Penny. And that, was enough for me.