"I could kiss you again." Kyle answered.
Sandy raised her eyebrows.
"Really?" she grinned. "This isn't big enough for you?"
In a quick motion she had bend slightly forward and placed her clenched fists against each other at the height of her stomach, producing a magnificent most-muscular pose, one of many Kyle had asked his sisters to do over the years under the platonic pretense of checking up on their athletic development. Immediately, thick strands of flesh exploded all over her upper body as she flexed her new physique to its max. The gleaming skin of her forearms was stretched over massive chords of beef before disappearing under her sleeves that did their best to tightly wrap around her enormous upper arms. A pair of balled shoulders literally rounded of her amazingly wide frame as they flowed into her chunky traps. Easily visible under the fabric was her nice cleavage formed not only by her soft breasts, but also by the hard, juicy plates of pecs underneath them. A wide, tree-trunk sized neck led up to her face, graced with a satisfied smile.
"Wow!" Kyle exclaimed for the umpteenth time in the last half hour He could feel his member stiffen at the sight of so much glorious female muscle, despite the fact that he was looking at his own sister.
"Well?" Sandy smirked, almost giggling, at her brother's expression of amazement and barely concealed arousal.
"I'm just curious how this new power works." he answered. "But as far as you are concerned, you are absolute perfection. It's a shame you are my sister because right now you are my complete dream woman."
This made his sister smile more, flattered by the compliment. She lifted one arm up and presented him with a fantastic biceps flex, stretching the sleeves around the expanding mound of muscle. Without lowering the pose she came near to him, watching closely as his eyes widened at the erotic display in front of him.
"I don't know what exactly happened and how it works," she began, "but for giving me this wonderful body I definitely think you deserve a thank-you kiss."
Sandy placed her hands on her brother's back and pulled him close. She even accidentally squeezed him a bit as she didn't consider that she would have to extend her arms wider to make up for their dramatically larger size. Kyle could feel her gargantuan thighs against his athletic yet somewhat thin ones, twitching with every of her slight movements. She could feel his erection pressed against her belly which was adorned with eight massive chunks of solid muscles, flexing against his hardening dick. Feeling naughty, she even deliberately tensed and relaxed them a couple of times to excite her brother even more. He moved his hands on her back and lightly pressed against the vast area of unyielding flesh right beneath his palms, separated only by a thin layer of warm and ever so slightly damp fabric. His chest rubbed against her firm breasts but even as quite tight as they were they could never compare to the titanium hardness of pectoral mass right beneath them. In this overwhelming situation all he could do was to look down into his sister's eyes, twinkling back at him with complete joy over her new body.
He remained quiet as she stood herself on her toes and moved her face close to his. Kyle shivered when her she first made contact with him but was held still by her strong arms. Sandy's lush red lips touched her brother's in what could be a nice, innocent kiss. But soon it became more as both pressed their faces tighter into each other, determined to make sure that his power was properly applied once again. A soft moan escaped from the couple, impossible to determine who made the sound when they both slightly opened their mouths and let each other's breath fill their body. Both felt like never before, as this was the complete opposite of every simple peck they had ever given each other. Charged with the elements of forbidden lust for a sibling, the unforeseeable results of this second spell he was about to inflict on her and the excitement for both to see this once slender girl transformed into an even more incredible being made this the most intense kiss they had ever had in their young lifes.
After a short while of this wonderful scene, Sandy pulled her head away from Kyle, their eyes tightly locked in expectance of what was to come. It took a few moments for the effect to set in the first time, a wait they could now hardly stand as seconds seemingly expanded into hours. Still in each others arms they quietly tried to sense every single change that might happen. One thing was for sure - Kyle wouldn't miss feeling another fantastic muscle growth sequence with his own hands like he did just a couple of minutes earlier as he held on to her body as tightly as he could.
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