Button arrived at Sweetie Belle’s place early Saturday morning and knocked on the door. He couldn’t believe the most popular girl in the whole senior class, and probably the whole school, had offered to help him out with his schoolwork. Did she remember, he wondered, that they used to play together as kids?
He tried his best not to look nervous, but failed, for Sweetie’s older-sister Rarity answered the door, half-dressed and half-awake.
Wearing nothing but panties and a loose nightshirt that was just too short to hide them completely, to Button she may as well have been naked.
Button tried to avoid direct eye-contact without turning away, but she was taller than him and everywhere he looked was somewhere worse.
“Sweetie, your friend is here!” she shouted over her shoulder. Her tone was deadpan, with a mild a hint of annoyance.
“I’m not ready!” came the shrill reply from upstairs.
Rarity rolled her eyes as she lazily pulled her head back around. “She’s going to be a moment.” she said.
Then, rather suddenly, she seemed to perk up a bit, as though she had only now noticed Button and was pleasantly surprised to see him.
“Why don’t you come in. I’ll fetch us something to…” She glanced at the half-empty bottle of marelot in her hand, hidden from view beyond the doorframe. “Well, just come in and have a seat.”
She stepped aside to allow Button in, dropping the bottle behind her back into the concealing foliage of a houseplant.
Button kept his gaze on the floor until he reached the sofa, seating himself and hoping to simply wait for Sweetie there, alone.
He hoped in vain. Rarity dropped down next to him, lounging on the arm rest and taking up as much space as possible while Button sat stiff as an arrow, nervously locked in place.
Out of the corner of his eye he glimpsed her bare, slender legs tucked in, her feet upon the cushion and distressingly close to him.
He could smell her perfume, intermingled with the slightest scent of alcohol.
Curiosity welled inside him, and cautiously he turned his head until he could see her entirety, hoping she wouldn’t notice. Her right leg rested against the back of the seat, the other fallen to the side so that he could clearly see her underwear. Adjusting his gaze let him see the swell of her breasts and the shape of her nipples through the light fabric of her shirt.
She yawned, stretching her arms asymmetrically and extending her legs, which she allowed to come to rest on Button’s lap.
The electric feeling of someone else’s body weighing on his own was too much and he could feel himself getting hard, a small tent erecting itself in the space amidst the criss-cross of their legs.
“You don’t mind, do you? I’ve had an exhausting day.”
“Its fine.” he said quietly. It felt like he was adrift in spacetime, and his only instinct was to let things play out, watching from some retreat behind his eyes.
What was it about girls that felt so… otherworldly? It seemed to Button they simply got tails instead of heads on the ol’ coin flip, so what was this influence they had that was so… disarming?
His train of thought derailed as Rarity yawned again, stretching her slender arms behind her head. Through the loose arm holes of her shirt he could see the side of her boobs, and shivered. Was this pleasant, he wondered, or painful?
He decided to take a gamble, gently reaching out and resting his hand on her shin, checking to see if she would open her eyes. She did not, so he went a bit further, gingerly rubbing her legs, gently squeezing her calves.
She shifted slightly and he withdrew, until he heard her mutter under her breath. “Don’t…don’t stop.”
Button lifted Rarity’s legs and slipped under them, standing and turning around to face her, undoing his pants and stepping out of them. He grabbed her ankles and lifted them in the air, then turned the girl ninety degrees so that her shoulders were square up against the back of the couch.
Rarity looked bewildered—perhaps not actually having expected this outcome—but offered no complaint, her eyes drawn to Button’s unexpectedly fat cock slipping out of his underwear as it stiffened, then lowering like a drawbridge under its own weight.
Button rubbed the indentations opposite her ankle-joints with his thumbs, then slowly slid his hands downward along her legs, closing the gap between their genitals with a step. His hands tickled as they slid up her calves and onto her thighs, making her squirm.
He slipped his hands underneath her thighs, grabbing her buttocks with a little squeeze and lifting her up just enough to let her rest her arms on the back of the couch, inadvertently thrusting out her chest.
Seeing her breasts forward and her shoulders rolled back, his mind erupted with pleasant mist. He pressed the tip of his chubby cock against her panties, admiring the bony protrusions of her pelvis.
Both Rarity and Sweetie Belle were thin, delicate-looking things, like porcelain ballerinas, and somehow that thought drove him crazy, along with the consideration that Sweetie was just upstairs, oblivious while he prodded her sister with his cock.
He swept aside her panties, the fabric of the crotch bedewed with both their fluids. With a strength which he was, until now, pretty sure he didn’t have, he forced his way into Rarity’s tiny snatch, eliciting a sudden gasp from the girl and making her eyes go wide.
Then he bored into her, pushing the full length of his cock into her body, threading it through all the way until his scrotum reached her ass.
Rarity bit her lip as he pounded her, tits leaping. Button couldn’t hold back any longer, and as luck would have it Sweetie Belle came down just as he filled her moaning sister with cum, and met his eyes with horror.
Author's Note
This took way longer than it should have. 
I kept getting distracted with other things, 
but hopefully it’s an enjoyable little something or other. More of a proper ‘clop-fic’ than most of my other shorts. 
