Requested by marvel22stories: Y/N and Peter are hanging out at the pool, swimming and having fun together when the strings of Y/N's bikini top start to untie themselves. The wardrobe malfunction leads to Peter and Y/N getting frisky in the pool.

"For fucks' sake." I mumbled, my back turned to the full-length mirror and my head turned to look over my shoulder so that I could attempt to tie the top of my bikini together as I stood in mine and Peter's room in the Avengers' Tower. I groaned and shook my head as I knew that if I couldn't get this tied up properly, I couldn't go swimming with Peter. It was the type of bikini where the bottoms had ties on each hip to keep the front and back flaps together to make the bikini panties, and the top was just two strips of material to cover my breasts that sat on bits of string that tied around my back and around my neck. The problem with this bikini was that the bit around my neck never seemed to stay tied, which sucked because it was my favourite swimwear out of everything that I owned. My eyes flicked up in the mirror as I saw Peter walk into the room in his swimming trunks.

"Pete, thank god, I really need help tying this bikini." I sighed and turned around so that I was now facing the mirror as he came up behind me.

"You sure, baby? You sure that you don't need help untying it?" He flirted, making me smirk and shake my head as he leant down and started to kiss the back of my neck whilst tying my bikini for me.

"If you want to go swimming, shut up and tie the damn thing." I chuckled.

"Maybe I don't want to go swimming anymore, not after seeing you like this." He continued to tease, making me laugh and shake my head as he curled his arms around my waist from behind and continued to kiss my neck. Peter and I were both twenty-year-old Avengers, and had been dating since I'd joined the team a year ago. I loved Peter by this point and he loved me, so our relationship was going pretty damn well for a pair of slightly psychologically twisted young adults. Last month, Tony had given the team an early Christmas present in the form of installing a private pool, sauna and steam room on the floor just below all of our rooms, the luxurious new facilities only accessible to us and the rest of the team. Given how busy Peter and I had been with training and missions, as well as the fact that we wanted to try the pool out for the first time together, we hadn't had a chance yet to use the new pool, so when we had both discovered that we were off today, we had made a plan to use it. A plan that we wouldn't be able to carry out if Peter continued to turn me on like this.

"Stop it, Pete, we've waited a month for this chance, I'm not waiting another month because you couldn't keep it in your trunks." I chuckled, making him smirk at me as I moved out of his arms but took his hand as I passed him.

"But I'm horny now." He groaned teasingly as I started to pull him out of our room.

"And whose fault is that?" I returned.

"Yours actually, for looking so fucking hot in that bikini." He smirked, making me laugh and shake my head as we got into the elevator.

I sat on the steps of the pool, my body relaxed in the water up to my chest and my arms and back resting against the side of it as I watched Peter swimming around the pool that was deserted apart from us. I couldn't help but bite my lip and admire my perfect boyfriend from afar as he continued to swim, the boy ignorant to my gaze as I watched him. He had no idea how perfect he looked right now. He had fully submerged himself in the water as soon as we'd gotten here but he hadn't slicked his hair back, giving me the sexy-as-fuck look of him swimming around with wet curls that were hanging over his eyes slightly. And boy did he look good. Peter finally noticed my looks, making me smirk and bite my lip as he started to swim over to me.

"You checking me out, babe?" He smirked cockily, making me playfully roll my eyes and shake my head as he swam up to me so that his body was hovering over mine and in between my legs under the water with his hands resting on either side of my ass on the steps.

"What, am I not allowed to? Sorry, I didn't realise that you were taken." I flirted back, making his smirk widen as he nodded and leant up so that his lips were hovering underneath mine.

"Sorry, but yeah, I am taken. By an absolutely beautiful girl who looks so fucking sexy in her bikini too, so you've got no chance." He shook his head, making me laugh and throw my head back at his words.

"Damn, that sucks. She's a lucky girl, though, having a guy like you as her boyfriend." I continued to play along.

"I'd say that I'm the lucky one." He nodded, both of us smirking as he leant in and joined our lips. I returned the kiss, my eyes fluttering shut and my hand moving to hold his face as he moved closer to me in the water.

"Come on, let's swim together." He mumbled against my lips as he gently took my hands and pulled me away from the steps.

"Fuck, one second, Pete, I'm going to need you to tie this fucking thing up again." I sighed as I broke the kiss and turned around to face away from him as I felt the bits of fabric covering my breasts slipping away. I felt Peter's wet hands rise to the back of my neck, the feeling of the cold water sending a shiver down my spine as I held the flaps against my boobs. But he didn't tie it back up like I'd asked him to.

"Peter, what are you doing?" I chuckled, though my eyes fluttered shut and my head tilted automatically as instead of tying my bikini up, he pressed his lips to my neck and started to move his wet hands down my back to my waist.

"I'm asking you to have sex with me in the pool, angel." He mumbled against my skin, making me smirk and bite my lip as I looked at him over my shoulder.

"Mr Stark would kill us if he found out." I stated.

"He won't find out." Peter returned as he used his hands now cupping my waist to turn me around in the water so that I was facing him.

"Bullshit, he has cameras everywhere in this Tower." I scoffed.

"Then we'll go and delete the footage once we're done. Or, you know, keep it for a rainy day when we're both horny and want to watch it back." He flirted, making me smirk and shake my head as he teasingly pecked my lips as we started to float away from the steps.

"What if someone comes in?" I chuckled.

"They won't. But if they do, come here." He nodded, making my eyebrows furrow as he gently took my hands and curled them over his shoulders. I held onto him as he wrapped my legs around his waist underneath the water, both of us starting to float as the bikini flaps floated away from my chest so that my boobs were on display but the top was still on me because of the back string.

"We float around like this and it looks like nothing is happening, and we'll be able to hear anyone coming in in time for you to put your top back on. And in the meantime, I do this." He mumbled, making my breath hitch as I felt his hand slip into the front of my bikini bottoms. I bit my lip, both of us starting into each other's eyes and my arms and legs holding me against Peter's body as we started to float around and his fingers began to lightly tease my clit.

"Peter." I breathed, the feeling already translating into pleasure as I leant my head forward to rest on his shoulder.

"You still hesitant about having sex with me in the pool, baby?" He teased as he gently pressed his lips to the side of my head.

"Fuck no, don't stop." I shook my head, making him smirk as his fingers slowly but surely added more pressure to my clit. He rubbed them in circles against my folds, quiet moans sounding from my lips and my mouth hanging open as he continued to gently float us around the pool. The feeling of the water only added to the pleasure, the sensation of liquid sloshing all around me and partly submerging my body adding a new level and making what we were doing feel almost surreal. I gasped, my eyes squeezing shut and my grip on Peter's shoulders tightening as he pushed his finger into me.

"Jesus, Pete." I choked, my boyfriend's smirk never faltering as I raised my head and allowed him to lean in to start kissing my neck.

"Does that feel good, angel?" He cooed against my skin.

"So good, please, fuck." I moaned as his finger started to move in and out of me. With his digit fingering me came the start of the knot building in my stomach, his long finger brushing my g-spot each time and sending pleasure through my body already as he fingered me. That, added to the danger of being caught because of where we were having sex all turned me on even more and only made the knot grow faster in my stomach.

"Peter, faster, please." I begged, his lips still leaving open-mouthed and nippy kisses on my neck as he continued to pleasure me.

"Naughty girl, wanting it even faster when I'm already pleasuring you so well." He cooed, making me smirk and bite my lip as his arm sped up under the water so that it was now shaking with how quickly he was fingering me. Moans were freely leaving my lips by now, every thrust of Peter's finger into me sending me hurtling towards my orgasm. Something about the fact that we were surrounded in water and could get caught at any second was only doing it more for me, the context and danger helping me get to my orgasm quicker as Peter's arm shook violently. Until I was there.

"Fuck, Pete, shit." I choked as my orgasm hit me. I came onto his finger, waves of pleasure coursing through me and taking over in seconds as I squeezed my eyes shut. My mouth hung open as I tightly gripped his shoulders, my legs coming loose around his waist at the feeling. It passed after a moment, making me sigh in relief and lock my feet back around his waist as he pulled his finger out of me before sticking into his mouth.

"Dammit, the chlorine washed you off of my finger when I pulled it up, I wanted to taste you." He sighed and tutted, making me laugh as he started to float us back towards the wall of the pool.

"If you do a good enough job of fucking me now, we can go into the steam room afterwards and I'll let you taste me in there." I flirted, making him smirk as he pinned me to the tiled wall.

"I always do a good job of fucking you, baby." He shook his head.

"True, you do." I teased, making his smirk widen as he leant in and kissed me again. I returned the kiss, my hands curling around his neck and tugging at the still wet curls at the nape of it as his fingers worked underneath the water to undo the ties of my bikini bottom. He undid it and quickly put the garment onto the side of the pool behind me, leaving me with just my top floating around my torso as we made out. I sucked in a breath against his lips, making him smirk as he teasingly rubbed the tip of his now hard dick against my still sensitive folds.

"Keep teasing me like that and we won't go into the steam room after this." I nodded. He smirked and pecked my lips again before starting to push into me. A quiet sigh left my lips at the feeling, my eyes fluttering shut and my hands pulling him closer as he bottomed out within seconds.

"Fuck, you somehow feel even better in water, shit." Peter moaned as he broke the kiss and dropped his head to my neck.

"I need you to move, Pete, please." I choked. He nodded against my shoulder, his hands gripping the sides of the pool on either side of my body as he started to thrust. He pulled almost completely out before shoving back in, making me cry out and moan at the feeling as he started to fuck me as quickly as he could with the water all around us slowing him down slightly. The knot in my stomach was already beginning to form again, quiet moans and chokes leaving both of our lips as he fucked me. His hips collided with mine underneath the water, my feet locking more solidly behind his back and pulling him closer again as my fingers pulled at the wet curls at the nape of his neck.

"Peter, fuck, just like that." I moaned, making him smirk as he leant up and started to leave open-mouthed and nippy kisses against my skin again to add to the pleasure.

"Feel good, baby?" He hummed against my neck.

"So good, please." I begged. His smirk widened, his grip on the wall getting even tighter beside me as my orgasm gradually crept up on me. All that could be heard was the quiet sound of the water splashing and sloshing around us, the disturbance in it not indicating how harshly my boyfriend was really fucking me underneath the surface. His tip hit my g-spot perfectly each time, moans freely leaving both of our lips as he fucked me into next week as best as he could with the water working against him. It was still enough, though.

"Babe, I'm getting close." I choked, his lips still working feverishly against my neck as I pulled on his curls and his hips snapped against mine underneath the water.

"So am I, angel, I'll get us there." He nodded. I returned it and bit my lip in a futile attempt to let less moans sound as the knot grew uncomfortably tight. My body started to tense in the water as it got ready for my orgasm, my fingers already pulling more at Peter's hair as his hips continued to snap against mine. Until the knot broke. I moaned loudly as my second orgasm hit me, my eyes squeezing shut as my body started to jolt between the wall and Peter's body. My legs gripped his waist again, my hands harshly tugging at his curls and my mouth hanging open as I let the feeling completely take me over.

"Fuck, baby, shit." Peter choked as he quickly pulled out of me so that he wouldn't cum inside of me whilst we weren't using protection. He came into the water between us, his eyes squeezing shut and his hands desperately gripping the wall as the white liquid shot into the water before slowing down. We panted heavily, Peter's head leaning down and resting on my shoulder as I continued to play with his curls.

"Wow. That was amazing, but you are so dead when Mr Stark finds out that you came into his nice and shiny new pool." I smirked, making him laugh and shake his head as he looked back up and tucked his softening dick back into his trunks before handing me my bottoms again.

"Well it's a good thing that he's never going to find out then, isn't it, angel?" He winked, making me laugh and shake my head as I tied my bikini bottoms back around me before turning around so that my back was turned to Peter.

"Actually tie it up this time, please." I chuckled. He returned it as I raised the flaps so that they were covering my boobs again, Peter's wet hands on the back of my neck as he tied the bikini back against my chest.

"There you go, babe. All tied up again. Just maybe not in the way that I usually tie you up." he continued to flirt, making me smirk and look at him as he floated to be in front of me.

"Come on, Pete, I believe that I promised you a round two in the steam room." I teased as I took his hand and started to walk up the steps of the pool. His eyes widened.

"Yes, you did, baby." He scoffed and nodded, making me giggle as he shot up after me and started to pull me towards the steam room, laughs and chuckles leaving our lips as we rushed in and shut the door behind us.