**Moonlit Transformation**

Eli Thompson wandered through the park alone, his 13-year-old frame dwarfed by the towering oaks and dimly lit pathways. The air was cool, the crispness of early fall evident in the way he pulled his yellow hoodie tighter around himself. Underneath, a white undershirt clung to his torso, while blue jeans and black and white sneakers completed his casual outfit. The park, usually teeming with families and joggers during the day, lay eerily silent now. It was a place where eerie stillness stretched its fingers, grasping at the meddlesome mind of anyone brave enough to wander through it after dark. Eli's breath was steady, though a strange sense of unease began to creep into his thoughts. Why had he come here so late, he wondered? Yet, something compelling seemed to draw him deeper into the park’s shadowy embrace. His steps crunched softly on the gravel path, each one echoing in the silence. Tall swings, still as statues, loomed beside a playground that was now a ghostly shell. As he walked, the moon peeked through the branch canopy, casting an almost supernatural silver glow onto the ground. It was a full moon tonight, round and imposing, a celestial eye watching his every move. Feeling an inexplicable tug, Eli turned around and looked up at the glowing orb. His eyes widened, fixated, as if the moon had woven an invisible thread that pulled relentlessly at his gaze. The silvery sheen seemed to penetrate his very soul, drawing something deep from within him. His legs quivered slightly, a tremor running up his spine. A ripple of discomfort spread through him, growing into a wave of palpable pain. It started as a mere tingling in his fingers and toes, but it quickly intensified. Eli gasped, his breath misting the chill air as horror etched onto his young features. Tiny hairs stood on end as his well-worn sneakers began to strain around his feet. With a bizarre, almost excruciating slowness, Eli’s bones started to elongate. The painful stretching sensation was heightened by an audible series of pops and cracks. Eli's hands, previously nimble and small, began to expand, the fingers swelling with taut muscle. His yellow hoodie, once a cozy fit, now felt restrictive, tightening unbearably around his burgeoning frame. The hem lifted as his height increased, exposing the white undershirt beneath it, which too was soon to suffer the same fate. His jeans creaked ominously, seams groaning under the stress. The muscles in his calves and thighs ballooned rapidly, each fiber thickening until they burst their denim confines. His hoodie sleeves were the next to give way, tearing loudly as his biceps and forearms swelled exponentially. The pull of transformation was relentless, dragging with it every cell of his being. Eli let out a strangled scream, but it morphed into a guttural growl, filling the night air with an inhuman resonance. His back arched involuntarily, vertebrae pushing against the skin visibly before settling, leaving him hunched temporarily. The yellow fabric tore further, exposing a back now latticed with thick, sinewy muscle. His once-normal feet underwent a grotesque transformation. Toes thickened and lengthened, pressing painfully against the confines of his sneakers until they, too, could hold no more. The shoes exploded apart, revealing monstrous feet beneath. Eli's torso stretched upwards and outwards, solidifying him as a formidable, beastly figure. His face, contorted with pain and confusion, also began to change. The amplification of muscles continued up his chest and shoulders, pitch-perfect pain mingling with twitching intensity. His awareness was slipping away, as if the very act of transformation was consuming his sanity. Veins bulged, skin stretched beyond its previously soft limits, becoming coarse and textured. His once gentle eyes turned wild and feral, irises shifting to a penetrating yellow. Teeth lengthened into sharp fangs that jutted beyond his lips. Eli’s entire body vibrated with a primal energy, the boy he was quickly eclipsed by the beast he became. His hoodie and undershirt, nothing more than tatters now, hung in shredded remnants around his neck. The park, once silent, was now filled with the sound of tearing fabric and beastly bellows echoing out into the night. In a final, cataclysmic surge, Eli fully transformed. His height had almost doubled, leaving him towering and expansive. Both mental faculties and control were stripped away, replaced by an instinctual urge to run, hunt, and dominate. The beast howled - a wild, resonating cry of defiance and confusion. With his mind completely lost to the transformation, the park no longer seemed haunted by stillness but by the terror born anew in its heart. Eli, now a muscle-bound creature of the night, vanished into the woods, leaving behind only the remnants of his former self and the shattered tranquility of the night.