“See! Told you they wouldn’t be the same size!”
“No…No way, that’s…That’s total bullshit…!” You whine. ‘Identical twins’ means you’re supposed to be identical! So why was she so much bigger than you??
Same shape, same color, even the same amount of foreskin. Hers looked just like yours, just…Noticeably, significantly larger. Seeing it almost makes you despair.
“Looks like we finally know who’s the big sister, huh?” She giggled, slapping the head of her cock on yours with a meaty ‘plap’. Your cheeks burn red, and you cross your arms over your chest to try and hide. She was never gonna let you live this down, was she?
“S-Shut up…! This…This doesn’t mean anything…! You just got lucky…!” Your words sound more and more like girly, pouty whimpers. You look into your twin's eyes, and it’s like staring into a mirror. Your face, your hair, your body - And yet, with her endowment hanging limp between her thighs, she looks undeniably superior to you in every way.
“Maybe…” She slides her cock up against yours, and you can feel the difference in size as it snuggles with your girly bits. She wraps her hand around them both, squeezing them together. “…Or maybe I was just born better than you?”
You start to respond, but your own moan cuts you off. She starts to gently stroke herself against you, the weight and friction of her cock dragging along yours, pulling more sweet sounds from your lips. You scramble to rationalize what’s happening. “You…You must’ve hit puberty first! That’s all…I’ll catch up…” You pant between whines.
“Mmmmhm…” She nods condescendingly. She picks up the pace and strokes your cocks faster, and you feel hers begin to throb atop yours. Feeling the massive chunk of meat flex and twitch against you makes you weak in the knees, something about the virility and power behind it just makes you feel so little and vulnerable. “Whatever you say, kid…”
You pout. “We’re the same a—“
“Hey, shut the fuck up for a second…” Her voice is husky beneath her breath. It scares you how quickly you obey and fall silent. She’s starting to growl, and the way she’s jerking your cocks grows frantic and hurried. Is…Is she gonna…?
“Fuck—!” She moans. Her cock throbs and spasms violently as it spews cum across yours. It practically paints the entirety of your length, stubborn dribbles still leaking off her slit. When it’s done, she’s huffing and panting heavily under her breath, collecting herself.
You don’t even know what to say. You’re the same height, and have the same face, and yet, when you look into her eyes, you feel as though you’re on your knees, gazing up at your natural born superior. Your eyes drift back to her cock, and your own, covered in her cum. You see again how much larger and heavier than you she is.
It’s so unfair…Why did she get to be so big…?
She takes her leaking head and smushes it up against yours, making an obnoxious kissing sound with her lips. You hear your own voice from her mouth as she speaks through a hazy giggle.
“This is what a real cock looks like, baby sis~”