Work Text:
Mandy stared at her breakfast with an annoyed frown, her face resting on one of her hands while she held a spoon with the other, her morning was not going so well. First her long, blonde hair had gotten painfully tied up while she slept, then the shower ran out of cold water, and now she was gonna be spending the whole day in the beach with her younger yet bustier sister.
She wanted to feel sexy by wearing a recently purchased bikini, but now she knew she was going to be in the shadow of her stacked up sister Kacey from morning to noon. It was not the first time that she was left bitterly watching by the sidelines as Kacey hogged all the attention from the attractive around.
It was so unfair, despite being older by a few years, her body was as average as it could be. Average bust size leaning on the smaller side, flat stomach but barely a hint of hips, and a firm yet small ass that struggled to fill out her pants.
Next to her sister, who’s tits stretched every top and who’s ass had ripped more than a few pairs of pants, she was downright plain and unattractive.
“Why the long face, Mandy?” Kacey asked as she finished her breakfast and stretched her arms over her head, her jiggling jugs threatening to pop the buttons off her lumberjack shirt. “I thought you liked going to the beach, I for one am very excited!”
“I like going to the beach alone.” Mandy answered as she sighed, making it clear to her sister why she was so moody this morning.
“Oooh, I see! You don’t wanna stand next to me and my amazing beach bod, huh?” Kacey teased as she leaned over the table, pointing at her older sister with a spoon as her cleavage made Mandy’s anger even larger.
“Fuck off! I don’t even wanna go anymore, enjoy getting ogled like a dumb bimbo.” Mandy said as she stood up from the table and began to pace to her room, getting stopped by Macey as she blocked the door and pushed her breasts onto Mandy’s chest.
“Heyy, don’t be like that, ManMan~ We’ll have lots of fun together! I’ll get all the guys, and you can bring us drinks!” Kacey laughed as Mandy tried to push her away, once again her physical Inferiority making itself clear as her much skinnier body failed to push Kacey’s.
“Goddammit, let go off me!!” In the sisterly struggle by the door, as Kacey let go off Mandy’s arm, the older sister’s arm shot down from the inertia of its movement. Her open palm dashing through the air and in a split second that was way too quick for either of them to react to, her hand found itself striking right in between Kacey’s legs.
“OOHH- F-FUCK!” The bustier sister yelled in pain as a sharp ache went up from her crotch to her stomach, her knees wobbling and clenching together as she fell to her knees covering her crotch with her hands in a vain attempt to make the pain go away.
“What… just happened?” Mandy asked confused, she wasn’t particularly strong, and that slap barely had any strength behind it. So why was her sister on the ground doubled over in pain?
“You hit my pussy, you- Fuck, it hurts so bad!” Kacey replied between groans and whines as her forehead touched the floor under them.
“I did?... Pfff…” Mandy had to hold her laughter as her usually smug sister curled up in a ball at such a simple tap, she felt a rush of excitement as a whole new path opened itself in front of her eyes. “You know… I think I’m gonna enjoy this beach day~” she smirked as she went up to her room to get changed, Kacey’s ass up in the air as she tried every position imaginable to make the ache go away.
The ride to the beach was silent, Kacey fumed with anger and annoyance over her older sister’s smirking smugness up until they reached the beachside.
They took their time silently setting up the umbrella, chairs, and cooler. Not saying a word until Mandy gasped as she saw a tall, handsome, muscular guy walking out of the sea, his muscles glistening with the water and his pecs bouncing with every step.
“Hey, Kace. You finish up with the setting up, I’ll be chatting with that hunk over there…” she said as she licked her lips and stood up and dusted the sand off her knees.
“Oh really? Hey, ManMan.” As Kacey pronounced the playful nickname she had given her sister, her leg quickly shot upwards in between Mandy’s legs. A surprise kick that was meant to neutralize her older sister quickly and definitely.
TUNK
“Aaagh!! What the hell!” But instead the one to cry out in pain was Kacey. Her shin made impact with something hard that deflected all the force she put on her kick.
“Hahahaha! I knew you were gonna do that, bitch. That’s why I came prepared with a cup!” Mandy revealed triumphantly as she tap tapped her crotch to show it’s protection.
“Besides, that kick was very weak. If you wanted to take me down you should do it like this!-“
THUMP!
“OOOHHH G-God!” Kacey’s feet were lifted off the floor for a split second as Mandy kneed her pussy much harder than the slap she had received before.
She dropped to the ground instantly, clutching her abused crotch and punching down the sand as she trembled with her head on the sand.
“That’ll teach you to put some respect on your big sis. Now stay down there and keep your cow tits out of the way while I go flirt with that guy. See ya later, Kace~” Now with Kacey doubled over, her knees in the sand and her hands cupping her aching crotch, Mandy finally felt like she could hold her head high and proudly display her assets feeling any shame or envy.