Dru decides to show off

You catch yourself staring at your kid sister's youthful bosom, and her impossibly thin waist. She has a new costume, similar to yours, but different. She's obviously modified it to show off. She now sports, like you, a strapless red and gold top, but instead of a full-waisted bustier top it's cropped off below her breasts, baring her well-toned midriff. Not something you'd wear; you'd look ridiculous with your bulging tummy on display.

She's wearing star-spangled panties like yours. She even has a belt that fits loosely around her waist, resting on her nicely curved hips. Her belt looks very much like your power belt, although you notice that it seems to have a more tarnished look compared to the shiny girdle fastened tightly around your belly. You wonder where the heck she might have dug up a vintage accessory like that, but of course teenage girls have a way.... You'll ask her about it later.

You look back upward, forcing yourself to tear your eyes away from her pert 'n pretty breasts, doing your best to look her in the eye. You're embarrassed that she's now your equal in height.

"So," you say, putting your hands on your hips.

She smiles real big, looking down toward your waist. You discretely suck in your gut, but she only smiles more, then giggles, then approaches you. She walks right up to you, her head held so high you start to wonder if she might even be a little taller than you!

Her body almost touches yours now, and she reaches her hands out, placing them on your waist! You're so surprised you almost gasp, and reflexively start to bring your elbows down to your sides. But of course it's too late; she's already grabbed your plump waist.

"So," she says back, smiling in a smart-ass way, "startin' to get a little pudgy around the middle, huh sis?"

You seethe inwardly, pursing your lips. You start to get in a huff. But there's no denying it. Your face blushes slightly and you turn your head....

"Oh come on," the younger Amazon coaxes you, "it's just me! Don't get mad at me...."

You smile resignedly and nod your head -- not meeting her eye, though.

Suddenly she pulls you closer, taking one hand off your waist and grabbing your ass! She's squeezed up against you, and while she still has the element of surprise, she locks her lips onto yours and kisses you!

You mumble muffledly in protest, but your kid sister grabs you tighter, pulling your fat ass up and pressing the small of your back. You're almost on tippy-toes! As you breathe in in surprise, her tongue follows! You can't resist. You even start to moan a little bit, letting her control you. You're starting to get a little weak in the knees as you rest against her.

Then, just as suddenly, she withdraws her tongue, gives you one more slap on the butt and then holds you at arms' length. Surprised again, you almost stumble before regaining your footing.

She laughs, then pulls you a little closer again, but instead of embracing you she quickly reaches for your power belt! She's fumbling with the clasp, trying to unhook your belt!

"Dru, what are you....," you start to ask. Then, "Ooofff!," she pokes your gut!

"Suck it in, sis!," she yells. Then she yanks it free, and, sproing!, you're ungirdled! You exhale loudly as your belly is unbelted. You place your hands on your bulging waist, embarrassed that your fit-as-a-fiddle kid sister is seeing your ungirdled bulge.

"Jeez, Diana! No wonder they say you're having trouble catching criminals nowadays! It's a wonder you can waddle down the street, much less run and jump!"

Now you're mad. You grit your teeth, and insist, "I am not having trouble running and jumping. There's, there's been a crime wave, and...."

"Uh-huh."

You watch helplessly as your younger sister shows off, wiggling her hips, holding her belt above her hips to accentuate how loosely it fits her slim waist, in contrast to your plump midriff.

Then she takes it off, takes her own belt off. She throws it, along with your power belt, over to the bed and challenges you, "Okay, no super powers. Let's have a test of strength!"

Your jaw drops. "What???"

"You heard me. C'mon," she goads you, starting to walk over to the nearby table.

You roll your eyes. "Now Dru, I don't see the point in that."

She walks back to you. "What's the matter, ol' sis? Afraid?" And with that she flexes her biceps. You can't help but stare. She's obviously gotten somewhat buff since you last saw her. She smiles at you again. Her shoulders and arms are femininely pretty, but at the same time nicely toned and firm.

You're a little apprehensive here. You don't want to embarrass yourself. With your slender white arms and without your power belt...

"Oh come on," Dru commands, grabbing you by the hand, "let's arm-wrestle. Just for fun!"

You almost stumble as she pulls you over to the table and shoves you toward one of the chairs. Your fat butt almost tips over the chair. Then she sits her athletic form opposite you and puts her elbow on the table, opening her hand.

You shrug your shoulders in exasperation and start to look away.

"Afraid?"

Deciding you have **** but to accept your sister's challenge, you roll your eyes and put your elbow on the table. You clasp hands.

"Ready?"

"Yes."

Your muscles tense and you grit your teeth... but your jaw opens a little in appreciation as you see Dru's biceps firm up and her breasts fill as she inhales. You are totally distracted! Whoa!, then you come to your senses as you feel your arm being pushed. You tense again and get down to business, preparing to push her back.

It doesn't happen. You square your shoulders and inhale and slam your lips closed, and concentrate on pushing your pesky sister back, but there's no moving her! You mentally reposition and regroup, grinding your teeth, lowering your head.

You're at a standstill! You start to think again about how embarrassing it would be if, unprepared and without your special powers, you prove unable to match your younger Amazon sister. Your heart sinks at the thought.

Then you catch yourself. She's pushed you another inch! You tense yourself again, for what it's worth. You try to growl, although it comes out almost like a moan. You're ****! You can't let this happen! You curse under your breath. There's sweat forming on your brow, and you're holding position for now.

Then you feel it. You feel that your arm is about to shake. It's coming. No! You feel it. Your arm, it... it's starting to shake! You avoid eye-contact with your beautiful sister, but you see in the corner of your eye a look of confidence... a smile? Your eye wanders now, and you see Dru's shoulders, her biceps, so firm. You picture your own soft shoulders and slender arms... and you're shaking.

Your eyes wander again, this time to Dru's heaving bosom. Her perfect, sweating breasts are pumping up and down as she breathes, like a machine pumping against you....