You closed your eyes and imagined your little sister growing. When you opened your eyes, you saw her height slowly creeping upwards, her head near the shower head with every inch of growth. Misuzu felt a tingling sensation coursing through her body as she kept expanding.
"Wh-what's happening? Why do I feel so... good?" she moaned as she ran her fingers over her wet, silky skin.
You watched in amazement as your little sister quickly inched upwards, her tall figure bewildering you beyond your wildest dreams. Soon, she was taller than you, sporting a bigger bust and a sexier physique that put your own to shame. You couldn't help but feel turned on seeing your "little" sister overtake you in size and appearance.
You mindlessly reached out and gently touched her thigh, marveling at how firm and smooth it felt beneath your fingers. You were worried she wouldn't react well to your act, but Misuzu was too caught up in the blinding sensation to notice you. Without any more apprehension, you began to helplessly glide your fingers over her body, caressing her curvy, delicious features.
However, her growth didn't stop there as she shot past the five-foot mark and towered higher and higher with each passing second. It didn't take long until you were level with her breasts. Her DDs stared right back at you, and you instinctively cupped them in your hands. You didn't care if Misuzu noticed you because you were enjoying yourself too much to stop.
Not very long later, she shot past six feet tall, and her height crept up until it slid to a halt at 6'8". Misuzu, who had been fingering herself, looked around in surprise as the pleasure slowly dissipated to nothing. You gulped as you looked up at her towering, womanly figure, which drove you crazy with desire.
"That was... amazing," she murmured as she unknowingly stepped out of the shower.
The sound of her voice sent shivers of delight down your spine. What was once a childish, playful voice was replaced with a deep, sultry timbre, resonating with maturity yet maintaining her youthful inflection.
Misuzu looked in the mirror to see her striking beauty and size reflected back to herself. "My god, is that me?" she exclaimed, admiring her stunning appearance.
You walked up and stood next to her. Power emanated from every inch of her body, an aura that you couldn't resist. In the shadows of your own invisibility, you checked out her body. Her feet were gigantic, capable of fitting in a size 15 shoe. Her legs were long and luscious, standing tall like a goddess. And her butt became round and firm, proportionate to her height. You hesitantly touched it, and Misuzu jumped in surprise.
"What was that!?" she gasped as she turned around, only to see nothing.
You let out a small giggle at her childish reaction.
"I-I can hear you! Whoever you are!" Misuzu stammered, her long, powerful legs trembling in fear.
Feeling remorseful, you decided to reveal yourself. Misuzu's expression turned from fright to shock as you magically appeared before her. "WHAT THE-!!!" she screamed in terror. "JESUS CHRIST!!!"
Misuzu lost control of her balance and stumbled backward onto the sink. You covered your mouth in astonishment, realizing you didn't expect her reaction to be this intense.
"Sis?!! Are you okay???" you asked, your voice filled with concern.
Misuzu stood up in sheer disbelief, trying to regain her bearings. "Nayuki," she said, her voice lowering to a calmer tone. "Were you the one who did this?"
"Yes, little sis," you say, unable to keep your eyes away from her tits. "I... did this."
"But... how?" she questioned, still trying to find reason in all of this.
"Watch this," you said, and with the snap of my fingers, you increased her breast size from DD to EE.
They jiggled as they protruded from her chest, causing her to squeal in delight. "What!? No way!!! Sis, you never told me you could do that!" she exclaimed, her eyes widening in surprise.
You giggled at her response. "Yeah, I know," you replied with a playful tone.
"What else can you do?" she eagerly wondered.
"Well... what do you want me to do?" you purred seductively.
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