The nutty scent of your morning coffee rose tantalizingly from the freshly opened bag, beckoning you into the world of the living. A deep sniff did a great deal of work in waking you for the day.
"Mmmaahhh... that's good." You sighed to no one in particular.
As you began to scoop, you heard a loud thumping coming slowly down the stairs.
"Good morning, Lauren." You called out, knowing that thumps of that size must belong to your larger sister. Imagine your surprise, then, as Meg instead walks through the door. Your jaw dropped. Since you had seen your little sister last, her stomach had grown about three inches from the repeated stuffings. Its rounded contour filled her t-shirt out in a way that it had never been filled before. But this was not the most surprising thing. Flat little Megan, Meggy no-cups, the Ironing Board... that had changed. The fat that Meg had piled on also went to her tits this time.
Due to her lack of endowment, Meg rarely wore a bra. Now that her A-cups had blossomed into little round breasts, however, you were able to see just how much she had grown. Her nipples poked against the fabric.
"It's me, dummy!" Meg laughed, oblivious to it all. She sat down on the other side of the kitchen counter from where you were making your coffee. Leaning forward to rest her head on her hands, her breasts resting on the counter. They weren't big boobs, really - maybe small C's... but when you were used to the flatness all your life they looked enormous in comparison. You couldn't help but blush.
"Megan... What happened to you?" You spluttered, incredulous. "You're supposed to be working out!"
"Oh, um..." She looked away, avoiding your gaze. "I am."
You put down your coffee spoon. "Working out your jaw muscles, maybe! I thought we talked about this, Meg!"
Meg was silent.
"What were you thinking?! You're fatter than ever!" You exclaimed, your rage still taking you.
Your ears now picked up a soft whimper. You looked more closely at your sister, to find that she was sobbing quietly.
"...Meg?"
Meg began to cry, and got up from the seat at the counter.
"Meg, no, it's okay..." You tried to backpedal, but the deepening pit of dread in your stomach let you know you fucked up. Meg ran back upstairs, her backside jiggling as she went. Forget "cool big brother." Now you're just an asshole.
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Meg, crying, ran up the stairs to the room of the person she last thought she'd run to. Lauren.
Lauren opened her room to see her younger sister fatter than ever and sobbing profusely. Meg grabbed onto Lauren and wailed.
"Justin hates me!" Meg cried, her face buried in Lauren's shirt.
"Now, now." Lauren said, patting her younger sister's head. "What did he do?"
"He said I was fat and he yelled at me!"
"He said that?" Lauren grinned. "Aww, but that's simply not true, sis. He doesn't understand your passion! Your gift! Well, you know what we're going to do?"
Meg sniffled and stepped back, her eyes puffy and red. "...What?"
"We're gonna go out, and train hard, and we're gonna win! And when you're holding the trophy, Justin can't say shit! What do you say?"
Megan thought about this.