Vanessa looked up at the Power Girl poster hanging over the bed. The leotard-clad superhero gazed imperiously across the room, powerful limbs framing a curvaceous, busty torso. Jason followed her gaze upward, then slid closer to her on the bed. Together, they set their second set of changes in motion.
Six Months Later
A cool breeze off the lake breeze ruffled their hair. An astonishing transformation required a bold cover story. Their families thought they were away at a long-term medical trial. Jason's aunt forgot that he had the only key to the family's lakehouse. And so, with a bit of maintenance to get the cabin back in working order, and installed all the workout equipment they could ever want in the garage, they had all the that they needed to transform.
Vanessa grunted as she lifted the barbell off its rack. 400 pounds bounced gently across her shoulders as she took a shaky step back. Jason stepped into position to spot her. Today was max-out day, and it was time to set some personal bests.
Her red sports bra was on its last legs, one of the last remnants of her former self's wardrobe. Her breasts pushed forward, fuller and rounder than ever before, pushing the garment almost past capacity with over a cup-size of extra flesh. Her skin-tight workout shorts fared no better, stretched to her limit and sitting deep between her thick, rounded asscheeks. The slight chubbiness that used to fill out her figure was melting away to reveal muscular, tree-trunk legs, and a strong, rounded backside. Biceps and forearms flexed with newfound definition, sleek and powerful, as she set her feet once more and braced for the lift. New core muscles tightened, tracing deep lines down her torso. Not quite a six-pack, but powerful nonetheless. Two extra inches of height rounded out her changes, and she now stood an even 6' tall, halfway between her original statuesque 5' 10" and matching Jason's final height at 6' 2".
Finally ready, she descended into the squat. Jason hovered close, ready to assist, and whispered words of encouragement in her ear.
"You got this, come on--" Vanessa's brow furrowed with exertion as the weight started to rise. "-- show me you're a superhero."
A grunt escaped his girlfriend's lips, and she finished the rep. Barbell safely back on the rack, she turned to Jason as a huge grin broke across her face. He wrapped her up in a hug as she let out a heady laugh of elation, leaning in to press congratulatory kisses to the nape of her neck.
"Fantastic." She pecked his cheek in response to the praise.
"Your turn," she replied.
Jason gave a long-suffering groan, teasing smile on his lips, and rolled out his shoulders. By far the skinnier and shorter one before their transformations began, Jason's growth was even more explosive than his girlfriend's.
New muscle filled his frame, cut with deep, lean definition. He had blossomed over the past months, from 5' 8" and 120 scrawny pounds to 5' 11" and packed with 180 pounds of burgeoning muscle. Pecs jutted forward from his chest. A lean, ever-deepening six-pack bracketed by thick obliques filled out his frame. His quads had doubled in circumference already, with much more muscle yet to come. Any movement of his arms sent striations rippling up his forearms and made his biceps and triceps bulging with definition.
He slid under the bar pre-loaded on the bench press, 300 pounds of steel. He grunted, and the weight rose from its rack. Vanessa's hands hovered, just in case. The bar lowered smoothly, months of practice guiding his form. Pecs and biceps flared as the weight rose, slowly, and a little shakily, but steadily. A new record.
Her turn.
Vanessa slid under the bar, hands wrapping around the barbell experimentally as Jason hurried into position. 300 pounds was an impressive lift for any woman, barring true genetic anomalies like Laura, but their strength gains had not been exactly... normal. Within weeks of working out, weights that should have felt heavy began to feel shockingly light, far outpacing their physical transformation. As soon as they noticed, the two had made a pact to keep things even. Adding 10 pounds per week to their lifts was already a mouthwatering prospect, especially because their strength gains seemed to only be accelerating. And having a partner who could match them pound-for-pound? Even better.
She grunted, unracked the weight. A deep inhale brought the bar to her ample chest, and a strong exhale sent it back skyward. Perfect.
Workout finished, Jason wasted no time. He scooped her off the bench, reveling in his newfound ability to do so. Vanessa looped her arms around his neck, powerful arms flexing as she bore some of the weight for him. They stumbled through the door of the cabin and down the hallway, until Jason finally dislodged Vanessa with a powerful scoop of his arms, sending her flying across the room onto her bed.
"Brute," she accused. "You're Captain America, not the Hulk."
"Never said I was Steve Rogers," he bantered back. "I could be John Walker, driven to evil by the serum's side-effects."
He climbs onto the bed after her as Vanessa snorts at the reference.
"Glad we haven't become meatheads like my siblings. I was afraid we would turn to the dark side.--" She winds her arms around his neck, pulling him closer for a kiss before continuing. "-- obsessed with Instagram, counting macros, and sick gains."
"Never," Jason reassures between kisses. "Geek life forever."
Their hands begin to roam, tracing the outlines of each other's sweaty bodies. Hardly a day goes by where they don't thoroughly explore their new developments, but there's always something new to find.
Jason fingers the band of Vanessa's sports bra, breaking away from her lips to press kisses to the flesh spilling over the top hem.
"Time to retire this one too." He hooks his thumbs under, and it takes a concerted effort from both of them to shimmy the garment off her body.
"No one ever said becoming a superhero would require so much new underwear," she laments with a smile.
She cups a hand under a breast, and marvels at how round and full her breasts have become. "Worth it though."
Jason makes use of the distraction to peel her shorts off also, leaving her bare in all her glory.
With a buck of her hips, she turns the table, pinning Jason gently beneath her thick thighs. Practiced fingers find his waistband, and a brief shimmy of hips leaves both of them fully exposed.
They fit together the same way they always have: With giggles, reassurances, and stupid jokes at inopportune times. Their stamina was reaching an alarming state. They fucked all night a few weeks ago just to test the limits, and ended the session with Vanessa bent over the patio railing, watching the sunrise over the lake a Jason steadily pounded her from behind. So it's with practiced ease that they set to work on each other.
Vanessa trails a line of kisses down her boyfriend's torso, meandering towards his waist as she gives special attention to each new deepened crease of his abs. His cock is already at full mast, and it pulses to her touch as she leans close, sweeping slow, open-mouth kisses up and down the shaft. Jason's fingers tangle in her hair, and he groans at the stimulation. After a few more seconds of dedicated attention, she swivels, throwing a leg over his torso to present herself directly to Jason's waiting lips.
She resumes her ministrations, hands pumping Jason's shaft as her lips swirl up and down in long, lazy strokes. Waves of pleasure begin to grow as a familiar tongue sets to work. Jason works through her folds, hunting for the spots he knows she loves. Licking, sucking, and trailing lines of kisses up and down her inner thighs when he needs a second to breathe. Neither of them can hold out for long.
Jason taps the outside of her thigh, signaling that he's close. Her hands work his shaft, and she swirls her tongue around his head as she drives faster and faster, pushing him towards the edge. His shaft pulses in her hands, and she seals her lips of the head as he cums with a quiet grunt. She swallows quickly as rope after rope of cum fills her mouth. Behind her, Jason continues his attentions, not letting his own release distract him from the task at hand. Within minutes, she too has crested the peak, and her breath quickens as the tight knot wound inside her finally releases. Jason doesn't let up, licking and sucking until she's a boneless heat atop his body before finally flopping back himself.
They bask in the afterglow, curled up at the head of the bed.
"The next six months are going to be amazing," Jason says.
"The last six months have already been amazing," Vanessa retorts. "It only gets better from here."
Her hands traced Jason's abs in wonderment, thinking about what was to come. So much more growth, changes equal to all that they had experienced to date. Strength gains that would continue to skyrocket. They were sure to surpass her siblings by the end, strength growing to a level that would put her hulking musclehead siblings to shame. Although the thought stirred some excitement in her, of finally being on the same level as Greg and Laura in some way, the excitement was laced with no small amount of fear.
Greg and Laura's whole thing was to be the biggest and strongest, laser-focused on the being the most dominant physical specimens the world has ever seen. If she and Jason showed up and challenged that identity, how would they react?
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