Today was laundry day. Every Sunday, your sister would try to wash all of her clothes for the upcoming week. Every Sunday, she would ask you about how much detergent to use.

"How much detergent do you think I should use for this amount of clothing?"

It was like clockwork.

"Just add until the three on the measuring cup, Wonyoung. How have you not figured out how to estimate it yet?"

She pouted at you, her hips cocked while she held her laundry basket in her arms.

"I just wanted to make sure is all, of course I know how to do it," she mumbled.

"Of course you do," you teased.

She stamped her foot on the ground. "Well - don't expect me to ask help from you again." She made sure to have a big display of huffing before leaving.

"Without me, you might even get stuck in the dryer or something," you called after her.

You smiled to yourself. Your sister was a bit of an airhead, but she was your sister after all, so you let her slide. It didn't help that she was cute when she got teased.

You watched Netflix for not even ten minutes before your attention was grabbed by an Earth shattering scream.

"HELPPPPPPPPPPPPPPPPPPP!"

That was quick, you thought to yourself. You picked yourself up off the couch and walked over to the laundry room. She has to be overreacting. How much trouble could she actually get into while doing laundry?

As you walked into vision of the doorway you could see Wonyoung on her knees with her body halfway in the washing machine.

"Wonyoung? What's up? Why'd you scream?"

"I was looking for a sock in the back of the machine, but now I'm stuck. In. Here!" She tried pulling herself out but she couldn't make it.

You couldn't help but laugh at her situation. It was honestly so crazy that a part of you couldn't even believe that it happened. The other part of you knew that with Wonyoung, anything was possible.

"Don't just stand there and laugh! Help meeeee," she whined.

"You know, I distinctly remember you saying that you weren't going to ask me for help again," you teased.

"Pleaseeeeeeeeee, come on bro, are you really going to leave your sister stuck like this?"

"I mean… it would only be for a couple of hours before mom and dad get back. I feel like it wouldn't be that bad."

"Just - just please?" She sounded like she was on the verge of tears. As much as you enjoyed teasing her, you didn't want her to actually cry.

You let out a sigh. "Alright, lemme help you out. Do you know what's stuck?"

She tried pulling herself backwards again, to no avail. "I think my shirt is caught on something in here. It's gotten really twisted and stuck."

"Can't you just… take off your shirt?"

"I've triedddddd, but the way that I'm stuck, I don't think I'll be able to. Can you just try to pull me out?"

"Uhhhh," you looked around the room. There wasn't too much open space, with barely any room around Wonyoung. You awkwardly positioned yourself next to her and placed your hands on her hips. Your firmly grasped her sides, your fingers sinking into her skin. You tried to pull her out from your weird angle but you couldn't build enough force.

"Yeah, you're really stuck in there," you admitted.

"I told you! Do you think you could try again at a different angle?"

You couldn't really see anywhere else to go than right behind her that would be different, but there was almost no room behind her. You carefully moved behind her, trying to make sure you weren't accidentally touching her butt. You again placed your hands on her hips, and pulled her towards you. Your better positioning gave you the ability to use more force in pulling her back, but in doing so, you ended up pulling her ass against you. You were shocked at the sudden contact, but you couldn't deny that she had a nice ass, and having it rub up against you definitely wasn't a punishment.

Fortunately, you weren't the only one to notice how well this new position was going.

"Oh! I think that might've pulled me out a little bit. Keep trying!"

You dug your hands in deeper and kept pulling her into you. You could intimately feel the soft curves of her butt as it pressed against you. It didn't help that you were only wearing shorts. You were getting hard, understandably so, and the longer you kept pulling, the more likely she would feel the tent being pitched in your shorts rubbing against her ass.

After a couple more seconds of pulling, Wonyoung suddenly cried out, "OW OW OW OW OW OW!"

You immediately let go of her, allowing her to body to fall back into her original position. She turned her head, sheepishly looking towards you.

"Sorry if I scared you. It's just that you were gripping me a little too hard there haha!" She chuckled.

You flipped up the hem of her shirt to reveal her bare skin, and the red handprints left on it from your grip. You winced at the sight.

"Ooooo, sorry about that," you apologized.

"That's okay, but you think next time you pull, you could pull something else? Maybe use my pants as your handles instead of my hips, that way you won't have to worry about hurting me."

"Yeah, I can try that."

You went back and gripped the hem of her pants instead. This time when you pulled her back, you managed to pull her pants down too, exposing her pink underwear underneath.

"Oh!" You were shocked. You probably shouldn't have been that surprised at the result, but to see your sister in her underwear was a new experience for you. You took your time staring at her shapely butt, resisting the urge to reach out and touch it. Your hand reached down to your shorts, palming your rapidly re-growing bulge.

Wonyoung, confused at why you stopped moving, tried turning her head to see what happened.

"What's going on? Why'd you stop? Did something happen?"

Explaining to her that you were staring at her ass after pulling down her pants was clearly off the table. You could also feel that you weren't starting to think straight, your brain becoming more and more muddled as your horniness increased.

"Uhhh nope, nothing wrong back here. Just taking a little bit of time to appreciate the view."

"What view?"

"Anyway let's try again," you continued.

You knew this was a bad idea, but you slowly pulled her back once again. Your breath hitched in your throat when you made contact with her panties. You didn't stop though. You kept moving forward, pushing your covered hard on until you were pressed up against her vagina, three layers of fabric separating you.

You paused, waiting for a reaction from Wonyoung.

"Um… is… is that…?" She trailed off.

You didn't say anything in response. You could feel her realizing the situation with every passing second. Her muscles tensed up and her breathing became shaky.

"Ha ha. Good joke, I know you're just trying to freak me out. You can stop now." Her voice was shaky, betraying the fake confidence she was trying to give off. You could tell she was scared, and that made you even more aroused.

You started sliding yourself along her panties, relishing in the friction that came from it. A gasp came from your sister as you started dry humping her.

"Nonononono! Stop, stop!" She cried. She wriggled her body, unsuccessfully trying to push you away. You ignored her protests as you continued rubbing against her. You gyrated your hips and Wonyoung let out small noises of pleasure, a stark contrast to her pleas for you to stop just a moment ago.

"Nghh… ughh… mmm…." her quiets grunts and groans increased in frequency until, "Eep!"

She let out a high pitched squeak as she came, her body shuddering. You could feel the wetness seeping through the thin piece of clothing she had on. You pulled your hips back to see a damp spot on had formed for her.

"Hey sis?" You started, speaking for the first time in what felt like ages.

"Yeah?" Her voice was a bit strained but underneath you thought you could hear something else, or maybe you were just imagining things.

You peeled her panties off, a strand of her cum obscenely clinging on to it as you revealed her pussy to your waiting gaze. Her bright pink lips were glistening, slick with a mixture of her of lubricant and her cum. You could feel your eyes glossing over with desire. You stepped out of your shorts and underwear, your cock throbbing at the sight in front of you.

"I need this."

"Wha-? OHHHhhhhh!" You slammed your cock in to the hilt, interrupting her and forcing out a loud moan. Her pussy readily accepted you in, but your sister herself was less welcoming.

"Stop! Ahhhhh~ You can't fuck me!"

Her protests fell on deaf ears as you thrusted into her, basking in the feeling of Wonyoung's tight pussy around your cock. You felt guilty, taking advantage of your sister while she was helpless, but she felt so good that you didn't want to stop. You kept fucking her, pushing her further and further into the washing machine.

"Oh, oh, oh, stoppppppppp~" She panted, her noises reverberating throughout the machine.

"I'm sorry Wonyoung, you're just too tempting, how could I resist you?" You hoped that she would accept your apology later, but that was something to deal with later

Wonyoung's cheeks flushed red at your words. "You… oh.. you shouldn't s-say thaaaaat," she stammered.

She was so cute when she got flustered, and it was driving you crazy. You felt your core tightening and every moment brought you closer to the edge. You didn't want it to end so soon but you couldn't hold it for much longer.

"Wonyoung," you gritted out. "I'm gonna cum."

"Don't cum inside me, please," she begged. She tried to plead with you, but she was getting overwhelmed, her mind not thinking straight. "Just- ohhh~ Ju- I-I'm coming! Eeeeek!"

You tried to hold on but you knew you couldn't. She was just so tight, and while she came she squeezed you in a way you couldn't describe. You drove yourself as far as you could, shooting your seed deep inside her. You waited for your dick to soften before pulling out. You looked at her freshly fucked pussy, your cum starting to leak out of the hole.

You and Wonyoung were breathing heavily, both of you trying to catch your breath and figure out what had just happened. Your sister was the first one to move, turning over onto her side. To both of your surprise, her shirt popped right out of the washing machine.

"Guess I did help out, huh?" You joked.

Wonyoung shook her head, a light smile forming on her lips. "Now I have to wash some more clothes, thanks to you."

"So what I'm hearing is a 'thank you'?"

She dramatically sighed. "Yeah. Thanks."