Requested by Meg_Weasley24: Y/N lost her father, Tony Stark, and distances herself from everyone, including her boyfriend Peter and little sister Morgan. She does this so she can go back in time and sacrifice herself to save Tony. Peter finds out and stops her before helping her to get back to normal.

*Please note: I didn't think about the ages in this chapter in regards to the blip, so please don't analyse what ages Peter and Y/N would have been beforehand and stuff like that. In this chapter, they're both 17, and that's all that matters lol. Thank you, and enjoy xoxo*

I stared at my dad, tears streaming uncontrollably down my face and my hand clutching the still bleeding wound on my waist as Peter's arm wrapped around my waist held my weak body up. Dad was also crying, a gentle smile on his lips as he held up the hand that had the infinity stones on it. And he was only seconds away from sacrificing himself to make sure that Thanos didn't destroy all of our lives for a second time.

"Please don't do this, dad. Don't leave me." I choked and shook my head.

"It's okay, honey, it's alright. I love you." He nodded before clicking his fingers.

"NO!"

"NO!" I screamed as my body was violently jolted awake. I shot up into a sitting position, my chest rising and heaving with heavy breaths as my heart almost pounded out of my chest.

"You're okay, baby, I'm here, you're okay." I choked and shook my head as Peter's voice filled my ears. Normally the heavenly sound would send me straight back into calm, but ever since I had decided on my plan of action, it had done the opposite. It had pushed me further away from the love of my life.

"Babe, look at me." Peter spoke softly as his hands cupped my cheeks in an attempt to make me look at him. But I resisted. I shook my head and pushed his hands away before standing from the bed, not another word passing either of our lips as I slumped into our en-suite and turned the light on. I took deep breaths as I leant against the counter, everything in me ready to turn back time as I was once again haunted by the memory of my beloved dad dying right in front of me. I was the oldest daughter of Tony Stark, my seventeenth birthday having been only a month ago. And the first one celebrated without the man who had been my best friend for my whole life. My dad had died in the battle against Thanos, one of his last gifts to me being to bring back Peter Parker, my boyfriend and the love of my life, before he snapped his fingers and sacrificed himself for the sake of humanity. But not a day went by that I wished that he hadn't made that fateful decision. It had been three months since that day, and almost every morning since, I had woken up screaming and crying as my brain forced me to relive the painful memory every time that I closed my eyes. Of course Peter did all that he could, and it had worked for the first two months. He would cup my cheeks and make me look at him before joining our foreheads and breathing with me. After I would calm down, he'd lie us back down with his arms protectively holding me, and we'd both fall back asleep with tears running down our faces. But all of that had changed a month ago, on my birthday. Because that was the day that I'd decided that I was going to go to Stephen Strange, and ask for the time stone so that I could go back, and sacrifice myself in order to save my dad. The issue was that Peter and Morgan didn't know that. And they never would. Not until it was too late. Not until I was gone.

Peter's P.O.V

Peter's eyebrows furrowed in his sleep, his arm starting to clench around Y/N's waist and his heart starting to speed up as his Spidey senses picked up something wrong. He just didn't know what it was until a few seconds later.

"NO!" Y/N screamed as her body jolted awake. Peter's eyes flew open immediately as his girlfriend shot up into a sitting position, her chest rising and heaving with heavy breaths.

"You're okay, baby, I'm here, you're okay." Peter cooed tiredly, but Y/N only choked and shook her head as the boy sat up and went to cup the love of his life's cheeks in reassurance.

"Babe, look at me." Peter spoke softly as his hands cupped her cheeks in an attempt to make her look at him. But she resisted, just like she had every night for a month now. Y/N shook her head and pushed his hands away before standing from the bed, not another word passing either of their lips as she slumped into their en-suite and turned the light on. Peter sighed, his heart breaking at the sight of Y/N so hurt and lost as she leant against the counter. When Tony had died in front of the pair, it had utterly broken both of them, but Y/N was having a significantly harder time overcoming that grief. She had steadily been pushing Peter and Morgan away more and more every day for the past month, the girl seemingly now living in her own head as she struggled to come to terms with life without Mr Stark. It had been three months since that day, and almost every morning since, Y/N had woken up screaming and crying from nightmares encapsulating every detail of Mr Stark's death whenever she closed her eyes. Of course Peter did all that he could, and it had worked for the first two months. He would cup her gorgeous cheeks and make her look at him before joining their foreheads and breathing with her. After Y/N would calm down, he'd lie the pair back down with his arms protectively holding her, and they'd both fall back asleep with tears running down their faces. But all of that had changed a month ago, on Y/N's birthday. What worried Peter was that he didn't know why the change had occurred. All he knew was that his Spidey senses had been slightly off ever since, but wouldn't tell him what exactly was wrong. He just hoped that whatever it was, he would be able to stop it before it was too late. But right now, he simply wasn't sure if that was possible. And that alone was enough to fucking break him.

Peter sat on the sofa in the Avengers' Tower living room, his eyes on his phone as he waited for something, anything to happen. But he had to be careful what he wished for.

"Peter." The boy looked up at the sound, his lips automatically curling into a smile as Stephen Strange walked into the room from the elevators.

"Hey, Mr Strange, you okay?" Peter chuckled as he sat himself up slightly.

"Pete, you know that you can call me Stephen. Anyway, the reason for my being here is far too important for us to bicker about what you call me. I'm here about Y/N." Stephen nodded as he sat down next to Peter.

"Oh, okay, sorry but she's not here right now-."

"I said that I was here about her, not for her. We need to talk, Peter." Stephen replied. The boy's eyebrows furrowed, something about the tone of the man's voice starting to worry Peter as he looked at the grey-haired man.

"Why do I have a feeling that something is seriously wrong?" Peter gulped. Stephen sighed and looked at the boy.

"Y/N came to me a month ago, and told me her plans to do something really fucking stupid. And, well...tomorrow is the day for her. Tomorrow, she thinks that I'm going to give her the time stone so that she can go back to the final fight with Thanos, and sacrifice herself in order to save Tony." Stephen admitted. Peter's eyes widened, his mouth falling open as he felt his heart drop to his stomach.

"You-what?! What are you talking about?" Peter scoffed and shook his head.

"She came to me a day after her seventeenth birthday, she was beyond reasoning. And she told me that she wanted to go back. She wanted to use the time stone to go back, and make sure that her dad didn't die. That she died in his place. That's why she's been so distant from you and Morgan, Pete. She wanted to make it as easy as possible for you two to live without her. I'm not saying that I agree with her methods, but there we are." Stephen nodded. Peter couldn't help but simply stare at the older man, tears pricking his eyes and his heart broken into a million pieces as he desperately tried to process what he had just been told. That the love of his life was planning to go back in time and end her life in order to save Mr Stark's. And he already knew that he had to stop her. He had to stop her in any way that he could.

"W-what the fuck?! I c-can't believe this. Why would she do that, why would she give away her life like that?" Peter choked and shook his head as tears started to leave his eyes.

"Pete, I don't think you realise how broken she was by Tony's death. You see her body forcing her awake every night, you hear her cries when she has no choice but to relive that day every single time that she closes her eyes. What you don't see is her mentally blaming herself for it, despite any rational person knowing that what happened was no-one's fault, and especially not hers. That's what you don't see. And so in her mind, the only way to not only end that suffering but also to make things right, is to bring Tony back in place for her." Stephen explained.

"And you're telling me all of this so that I can stop her." Peter stated.

"Exactly." Stephen nodded. Peter returned it and gulped harshly in a weak attempt to swallow his tears, though it was hard with his heart being in his throat. It all made sense now, why Y/N had been so distant and isolated for the last month. Because she had been trying to make it easier for him and Morgan when she was gone, and that fucking broke Peter's heart. He had of course known that Mr Stark's death had damaged Y/N to her core, and that it would take a lifetime for her to come to terms with that pain, but he had had no idea that it was so bad that she was willing to sacrifice herself to get him back. Every wave of thought about it only made Peter sadder, and so of course he knew that he had to stop her. He wasn't going to let his girlfriend go again. He had already lost her once when he'd been blipped, he wasn't going to lose her again in a much more permanent way.

"Okay, Mr Strange, so what's the plan?"

"Don't call me Mr Strange."

"Right. Sorry."

Y/N's P.O.V

I lay in mine and Peter's bed, my eyes glued to the ceiling and my hands resting on Peter's arm that was hung loosely over my waist. The love of my life was still fast asleep next to me, his curls tickling my neck and soft snores leaving his parted lips as his body lay partly on top of me. I bit my lip harshly and tried not to cry, my heart feeling numb at the fact that this was the last time that I'd be lying here with Peter like this. Of course he didn't know that, and I wasn't going to tell him, otherwise he'd only try to stop me. And I couldn't let that happen. I couldn't let Morgan grow up without our dad. I had been lucky enough to make it to sixteen with him, and I was going to make sure that Peter and Morgan had him for even longer. Even if that meant Peter losing me. I took a deep breath as I eased myself up onto my elbows before looking down at my boyfriend's still sleeping face. I leant down and gently pressed my lips to his cheek. Immediately he started to stir, a quiet groan coming from him as his hand raised to cup my cheek. I couldn't help but smile, my heart fluttering in my chest as Peter moved his face so that we were now kissing each other's lips instead of me kissing his cheek. Peter smiled into it and pulled me closer, his hand curling around to the back of my neck as he gently pulled me on top of him. I had to admit that I would miss this. I would miss the kisses, the cuddling, the sex, everything. I would miss just being able to call Peter mine. But I knew that this was for the best. And so no matter how much I didn't want to do this, I knew that I had to.

"I've got to go, Pete." I mumbled against his lips.

"No, you don't, let's stay in bed all day." He returned, making me giggle as he broke the kiss and moved his lips down to my neck whilst continuing to pull me closer.

"Peter, I mean it." I chuckled as I reluctantly pulled away from him. He sighed and flicked his chocolate eyes over my face, his hand still holding the back of my neck as I rested my hand on his naked chest.

"Why do you need to go, baby?" He asked quietly. I sighed and bit my lip, everything in me trying not to let tears prick my eyes as I looked into the eyes that I'd fallen in love with one final time.

"I...I just do, okay? I'll be back soon. I promise." I lied with a nod. Peter returned my sigh and looked at my lips before nodding too.

"Okay, angel. I love you." He spoke softly.

"I love you too, Pete. I love you too." I whispered before leaning down and kissing him one last time.

My heart was fucking numb, everything in me feeling like I was floating on air in the worst possible way as I walked along the street and towards The Sanctuary. This was it, I was really about to do this. To say that I was ready would be a bold-faced fucking lie. But I knew that it had to be done. And that was enough. I wandered up the steps, the large doors opening by themselves so that I could walk straight into the grand building.

"Hello? Stephen, it's me. Are you here?" I called out, my throat gulping as I heard the doors close behind me again.

"Stephen, I'm ready. I know that you think that I'm not, but I'm ready." I spoke again.

"Ready to do what?" My eyes wavered, my heart dropping to my stomach as Peter's voice rang out behind me. I gulped harshly, everything in me knowing why he was here as I tried to keep my breathing calm. I bit my lip and turned around, Peter wandering towards me nonchalantly. But his glassy eyes told me that he was anything but unbothered right now.

"Ready to go back in time and sacrifice yourself to get Mr Stark back? Ready for that?" He nodded. I gulped and shook my head.

"P-Peter, I-."

"You know that I can't let you do this, don't you?" Peter spoke as he continued to walk towards me.

"I have to, Peter. You know that I have to get dad back. For you and Morgan, I have to." I choked as tears started to leave my eyes.

"Baby, you know that this isn't right." He shook his head, a tear also leaving his eye as he reached his hands out, and put them on my biceps.

"Peter, you need to let me do this." I spoke with an increasingly wavering and cracking voice.

"Angel, you know that I can't." He choked as his grip on my arms tightened in order to keep me close to him.

"Peter." I sobbed and shook my head, my fists starting to pound against his chest in resistance, but he didn't let go.

"I know, baby, I know." He simply reassured me, both of us now in tears as he tightly wrapped his arms around me and pulled me into the warmth of his body. I sobbed uncontrollably into his t-shirt, both of us sinking to the cold floor of The Sanctuary with my body in his arms. Peter simply sat with me rocking in his lap, his lips pressing to my hair as his tears fell on my skin too. We just sat there for a moment, the only sound echoing through the grand entrance being that of us sobbing our hearts out as I held onto Peter for dear life.

"I'm sorry, Peter. I just, I couldn't do it anymore. I can't live knowing that dad died and we made it. I made it. I need to give you and Morgan dad back, I need to do this." I whispered.

"Baby, no, please listen to yourself. Everyone was devastated when we lost Mr Stark, of course we were. But none of us would want to exchange your life for his. Yes, I lost a mentor and Morgan lost her dad. But we still have you. I still have my amazing girlfriend and Morgan still has her loving, protective older sister. Neither of us would change that for the world. Especially if it meant that we had to lose you to get Mr Stark back." Peter cooed into my hair. I choked and nodded, my heart being mended ever so slightly by the love of my life's beyond gentle words as he continued to rock me. Continued to just hold me and let me cry into his arms. I knew that it would take a long time for me to get back to feeling like me, I had known that since the day that Peter had originally been blipped, and then had been reminded again on the day that dad had died. But I would get there. I would get there with the love of Peter. I would get there with the love of my life holding me every night until I fell asleep, and kissing me awake in the morning. And that was enough. That had always been enough.