My helpful sister
Sub M!Reader x tripleS Xinyu
Tags: Incest (oops), Pegging (oops), Fluff? (I tried my best)
3k words
“Noona… can I come in? I hope you’re not busy or anything.” I waited outside my older sister’s room, nervously pacing about. Without warning, the door opened and my sister’s tall frame came into view.
“What’s the matter? Xinyu-noona is here to help!” She placed a hand on my shoulder, her slender fingers gently gripping me.
“Noona, it’s kinda… embarrassing. I don’t want anyone else to hear, so…”
“Ah, come in then. I wonder what troubles my baby brother is facing this time.” She giggled which made me smile sheepishly. Xinyu was three years older than me and it showed, as she was taller than me too. As our parents were usually overseas for work, she was the one who had taken care of me during our teenage years and our bond was closer than that of other siblings.
“Before I say anything, promise me you won’t laugh okay? I’m serious…”
“Yah, when have I ever laughed at you when you needed my help? Do you really think I’d do that to you?” She pouted her lips and pretended to act hurt, which made me chuckle a little.
“C’mon noona, I know you won’t but… it’s really REALLY embarrassing, and I don’t know who else to ask.”
She sat on her bed and motioned for me to sit next to her, which I obliged. She put her shoulder around me and turned to face me.
“You know you can tell me anything right? Spill the beans!”
“Here goes nothing… Noona, you know me and my girlfriend have been dating for a while now and… we’re starting to do stuff in the bedroom…”
“WOAHHH! My baby brother is getting laid?!”
I playfully shoved her, feeling my face getting hotter as a result of having to tell my sister about my sex life.
“Shut up! We’ve… done the normal stuff so far… but the other day she asked me if I wanted to try… pegging.”
“Pegging?! Damn, your girlfriend sure is freaky.”
“The thing is, she seems really into it, but obviously, I don’t have any experience with this kinda stuff, so… I was wondering if you could, y’know, help me out here.”
Xinyu’s eyes widened in shock. “Huh?!”
“Look, I don’t trust the internet with this because it’s really subjective for everyone, and I also don’t wanna get caught researching on how to get pegged y’know. And besides… I thought that you understand me the best, so… you’d be able to help me out.”
My sister stared at me with a smirk, gears spinning in her head. I wouldn’t know it yet, but she was forming a plan in her head.
“Noona, I don’t wanna disappoint my girlfriend, okay? I don’t wanna look like a fool in front of her. Can you help me, pleaseee?” Even though it was super cringey, I put on my Puss in Boots face which was my secret weapon and my sister’s weakness. I could see her gaze soften and her grip on my shoulder loosened a little.
“Okay, okay, of course I’ll help my baby brother. So… what do you know about pegging?”
“I don’t really understand what this article is saying…” I showed her an article about pegging on my phone.
She shook her head in mock disappointment. “Tsk tsk, that’s not how you wanna do it. How about… some hands-on experience?”
I looked at her quizzically, not sure what she meant. She got up and walked over to her white bedside table, and from a drawer she pulled out something I had never seen before: a long, pink plastic dildo with a harness and a small transparent bottle of what I assumed was lube.
“Noona, is that…”
She nodded with a smile on her face and tossed the items over to me.
“This is gonna be so fun, baby brother.” She closed the distance between us, towering over me as I sat on her bed with my tail between my legs.
“Noona, what do you mean?”
“You know what I mean, don’t play dumb.” She playfully poked my shoulder. I looked at her confused, not knowing where she was headed with this.
“I’m gonna peg you, baby brother.”
Huh?!
All sorts of thoughts raced through my head. My own sister wanted to peg me?! No way I had heard that correctly, Xinyu would never say something like that to me… right?
“W-what? Are you crazy?” I protested incredulously.
“Look, hear me out,” she sat next to me on her bed. “It’s better for me to show you how it really is, rather than just some articles or videos. After all, some practical experience is definitely better right?” Her hand reached onto my thigh, fingers tracing circles near my crotch. My mind told me to get up and run away, that this was all sorts of wrong, that I shouldn’t be doing this with my own older sister. But the growing hardness in my pants convinced me otherwise, egged on by Xinyu’s fingers creeping closer and closer towards it.
“Noona, a-are you sure? This seems kinda wrong… We’re siblings after all.”
Hearing that, her other hand gently caressed my cheek and she turned my head to face her. There was a glint of lust in her eyes masked by the usual caring demeanour that she carried around me.
“Baby boy… don’t worry, don’t you trust your noona? I’m gonna take good care of you, okay? And besides, we’re not having real sex, so it’s not anything weird.”
Without me realising, her hand had inched its way onto my cock, rubbing my tip at an agonising pace. My breath quickened and I leaned into her, my face meeting her collarbone. Her scent intoxicated me, the whole situation driving me wild.
“Noona, are you sure?” I looked up at her, not knowing what to do.
Her piercing grey eyes met my wavering gaze and she nodded assuringly. She leaned forward and kissed my forehead.
“Baby boy… Noona loves you so much. I wouldn’t let you get hurt, okay?”
I nodded and hesitantly wrapped my arms around her, softly whispering, “O-okay, let’s do it noona. I… I love you too.”
She ruffled my hair lovingly, with her other hand still gently palming my cock. “Good boy… I’ll need you to listen to noona, okay?”
I nodded shyly, placing all my trust in her. My mind was racing as the boundaries between my sister and I started to disappear.
“Pull down your pants for me.”
Turning red, I obediently reached down and unbuttoned my cargo pants, pulling them down. My stiff erection was now straining against the waistband of my Calvin Klein boxers. I looked up to see Xinyu staring hungrily at my crotch which only made me more embarrassed.
“Holy fuck, I didn’t know my baby brother was packing a monster. Your girlfriend’s so lucky.”
I blushed at her praise, feeling a twisted sense of happiness that my sister was complimenting my cock. Her fingers crept into my boxers, slowly pulling the waistband down and freeing my raging boner.
“Fuck!” she exclaimed at the sight of my cock standing proudly for her. She immediately latched onto it and started to stroke me gently.
“Noona… that feels so good…”
She smiled at me while quickening her pace, her fingers deftly working my cock. Unable to hold it in any longer, I let out a soft moan and rested my head on her collarbone again.
“Mmm, someone’s getting worked up. Time for the real deal…” Her fingers left my crotch and instead went to the toys that were sitting on her bed.
“So, the first thing is to make sure that you use a lot of lube, otherwise it’s gonna hurt.” Her long, deft fingers unscrewed the bottlecap and slathered the pink toy with lube. I gawked at her actions, feeling the heat rise inside my body. Xinyu’s fingers expertly coated the dildo with the lube until it was glistening.
“Next, you need to relax and take deep breaths. If you don’t relax, it’s not gonna feel good, understand?” She moved closer towards me and placed a hand on my chest, feeling my quickening heartbeat. Relax, she whispered, and I felt a strange feeling bubbling inside me.
“Noona, I can’t… I’m nervous…”
“It’s okay, noona will take care of you. Just breathe in, breathe out… that’s it…”
Xinyu leaned forward and gave me a sudden peck on my cheek in an attempt to soothe me. How was I supposed to calm down now?
I nodded, my cheeks a faint shade of red, and tried my best to calm down for her. I trusted my sister to take care of me throughout this whole process, just like she’d done for basically my entire life.
“Here comes the fun part. I want you to get on all fours for noona.” She said with a devious smirk.
My body was now moving on its own; I felt like I was an outsider watching from above. Obediently, I lay down on Xinyu’s bed, waiting with bated breath. She got up behind me, her gentle hands holding my waist firmly.
“Fuck, I never knew you had such a cute ass.” She said with a giggle. Even though she couldn’t see it, I blushed hard and muttered out a solitary thanks.
“Now just relax. Noona’s in control now.”
I gulped hearing that, but I knew Xinyu would be gentle with me. Deep down, I also knew our relationship as brother and sister would never be the same again. There was no going back now.
She pulled my boxers all the way down and poured more lube on my now-exposed hole, which me made gasp in shock. The cold liquid combined with her finger probing at my sensitive spot was a completely new sensation. I could hear her breaths grow quicker in anticipation.
“Here it comes, baby brother.”
I felt the pressure of the toy at my entrance, straining against it. I gasped at this new feeling, pleasurable but also slightly uncomfortable. Xinyu’s hand gripped my waist harder. Her soft lips brushed against my cheek, a comforting gesture from the sister that I loved dearly.
The dildo strained a little more against me, before the head pushed into my hole. My mind went blank with both pain and pleasure and I moaned out loud. My sister patted my head as she pushed further into me, the plastic toy carving its way into my butt causing all sorts of new sensations. I moaned louder again, all thoughts escaping from my head except that of my sister and how she was completely in control of me right now.
“Good boy… You took it so well.”
I could only let out a timid mmph, the fullness of her strap turning my brain to mush. She remained in the same position, hands on my back and waist, her strap still lodged snugly inside me.
“I’m gonna leave it in you for a bit, let you get used to it, okay?”
It felt like an eternity, with Xinyu buried inside me, but in reality only about twenty seconds had passed.
“Gonna pull out now…”
Her nails dug into my skin and I whimpered, as she slowly pulled herself out of me. My knees buckled with the intensity of this new sensation and I couldn’t control my moans again. With a pop, Xinyu pulled the toy out and gave my butt a light spank.
“Good boy… that wasn’t so bad, was it?”
“N-no, noona…” I muttered weakly. I felt the coldness of more lube on my now-loosened hole, my sister’s warm hands holding me in place. Once again, her strap probed my entrance before sliding in, this time with less resistance than before.
I let out a guttural moan as Xinyu penetrated me again. My knees grew weak and my body sank to the bed, with my hands clinging onto her bedsheet for dear life.
“Noonaaaa… nghhh…”
It felt as if Xinyu’s strap was rearranging my insides with every thrust of her hips. Her hands tightened their grip on my waist, holding me steady as she started to gain a rhythm.
“Mmm, you look so cute on all fours for noona.”
I gasped as she picked up the pace, thrusting back and forth with more speed and less grace. Her room was filled with the slap-slap sounds of skin-on-skin and my needy, uncontrollable moans.
I started feeling lightheaded and overwhelmed with the pleasure my sister was giving me, even drooling a bit onto her pillow. A sudden harsh spank jolted me back to life as Xinyu pounded me with greater intensity.
“Your girlfriend’s so lucky to have you, you know that? I’m so jealous of her, if only I could have you all for myself…” My lust-filled fuzzy mind struggled to comprehend that last sentence, although it made me do a double take at my sister’s words.
“Noona… I… I’m close…” I moaned out weakly.
“Don’t touch yourself okay, just let it come naturally. Good boy…”
Hearing that I was reaching my climax, Xinyu picked up the pace and started pounding me faster and faster, driving me to the edge of my orgasm. I could feel her nails dig into my skin and I knew it was gonna leave a mark later. Not that I minded, of course.
It was a weird feeling, my first time that I would cum hands-free. I didn’t even know if I could do it, but as Xinyu repeatedly found my prostate, I knew it was inevitable.
“Noona… I’m gonna… gonna…” I couldn’t hold back any longer.
“Yes, cum for me, baby… show noona how much you love her…” Xinyu whispered sultrily in my ear.
A sharp spank sent me over the edge, and I shot streak after streak of cum onto her bedsheet. My knees slumped forward, all my energy spent. I could hear Xinyu gasp, followed by a cute giggle and another sudden spank.
“Oh my god… noona… that was so good.”
She gently ruffled my hair and slowly pulled her strap out of my ass, which sent me squirming once again. I turned around around to face her, panting, before leaning in for a hug. She wrapped me in her warm, loving embrace; it was as if we hadn’t just engaged in borderline incest.
“I know, baby brother, noona loved it too.” she said with a giggle. “Let’s do it again sometime.”
I blushed as this was just supposed to be “practice” for me with my girlfriend, but a part of me wanted this to be a more regular thing.
I shyly nodded in agreement, hugging her tighter in a mixture of embarrassment and forbidden desire.
Her fingers lifted my chin up and I met her piercing gaze. She spoke in a low tone, “Baby brother, can you promise noona one thing? If you wanna do this more, you’ve gotta…”
I gulped nervously, not knowing what rule or condition she was going to make.
“You’ve gotta break up with your girlfriend.”
My jaw dropped in shock. Why would my loving sister want me to break up with my girlfriend, just for this? My mind was a blur of emotions, I struggled to form a cohesive thought.
“Noona… why? I lo-” I was about to say “love”, but I realised deep down that my feelings for my girlfriend were nothing compared to what I felt for Xinyu.
“Look, which girl is going to want a guy that fucks his sister? And besides…” she traced my thigh with a solitary finger, “You’re mine now. You’re noona’s baby boy forever, and no girl is gonna take you away from me. I love you more than any other girl will, do you understand that?”
She gently stroked my cheek with her other hand, now speaking in a softer tone. “Noona loves you so much. I wanna take care of you forever. Please?”
My heart was overwhelmed with emotions, but my instinct told me to say yes, to give in to my sister that had loved me tenderly her whole life. No matter how wrong or forbidden it was, it was right to the two of us. I reached up to grasp her hand, nodding with a tentative smile on my face.
“O-okay, I’ll break up with her noona. I… I only want you too.”
Time seemed to slow down as Xinyu’s angelic face moved closer towards me. Leaning in for a kiss. My breath caught in my throat as I didn’t know what to do. I just closed my eyes, letting my body react on its own. Her soft lips met mine, hitting me with the taste of strawberry lip gloss. Her tongue made its way into my mouth, dominating mine as our tongues slid over each others’. I moaned softly as she continued to kiss me passionately, and I submitted to her. I sunk down into her bed and relaxed, as I let her take charge of the kiss. She gave my lower lip a gentle nibble, the sensation of it making me want her even more.
After a while, Xinyu backed away from the kiss, a wide smile on her lips. Seeing how happy she was, I couldn’t help but feel the same way.
“So… baby brother, ready for round 2?”
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Hi everyone! So sorry for disappearing, my work has taken up almost all of my time for the past few months. I really appreciate everyone who’s enjoyed my first two fics (part three will come soon, I promise). It still feels surreal that there are people out there who are looking forward to my work, I won’t disappoint you all! I really hope you enjoyed this piece :3 see you around!!