Henry suddenly felt a sensation like he was swimming in a strange mire, surrounded on all sides by something with the thickness of molasses - it was a sensation he wished would pass just from the sheer awkwardness of its sensation. But it persisted and Henry gasped out when he felt it close in and start molding to him - no, molding him. He was being shifted and manipulated somehow, by a force he could barely understand. He thought he saw eyes out of the corner of his vision, but he could not possibly have shifted his head even that much.
He was dimly aware he was growing now. The sensation got deeper and moved about him, and the boy matured toward a teenage male's countenance right there as he sank to his knees. The forest went dead quiet, and Henry choked out a groan as he felt the dirt and tattered grass on the ground through suddenly too thin pants.
Henry shook as he felt something like being filled, like he was eating the biggest meal he'd ever had, and he shook from how it felt. Wavering side to side, he was sure anyone who saw him would see a cringing boy. Instead, what would be seen over time would be an increasingly brawny lad.
Growing stronger and bigger right then and there, Henry's face slightly rounded out as he packed on weight for what was to be his new role. His pectorals pushed out more and more with weight and muscle - not quite attaining a toned look but more just packing on mass. His midsection packed on pounds - not a hint of abs present as a gut former there, all the better for taking hits and helping carry him through encounters with other young linebackers.
His arms thickened and grew stronger, even as they likewise developed less tone they were the biggest and thickest arms on the team. Henry somehow found himself remembering being called "Big Henry" due to his weight and the tremendous personal records he had accrued in the school gym. "Damn," he remembered the school Varcity quarterback saying, "If he's like this on the Sophomore Team, just imagine him in JV or Varcity..."
Henry found the sensations starting to waver and sluice back away from him as he began to stand back up on vastly stronger, more muscular legs, he had to have strong legs for carrying his heavy body. The growing teen shook and then was freed by whatever force afflicted him so. He breathed and looked over what became of him. His shirt was basically torn to pieces in the course of his growth, and his pants were likewise in poor condition.
"What...the...heck?" He rushed for the nearby stream and splashed water on his face to clear up the sweat, and saw his reflection. It was vastly different than he remembered, yet some part of him now remembered this being just how he was. Perhaps it was retaining how he was, but recalling now how he is. He had changed, indisputably, and everything reflected that.
"Damn. I'm...I'm bulky." Henry flexed an arm and chuckled in a somewhat good natured way. He felt his new gut and sighed, "No chance of abs there. Not like I need em. I'm brawny!"
Henry started wondering what he could do now - he remembered Will was back in the house, and maybe he'd need to break it to Will slow and easy that things had happened. Not freak him out. The teen jock crossed his arms, he was also however hoping to continue moving and see what was around here. His natural curiosity was taking him elsewhere. He also found himself wondering if any more changes like this were going to happen.
The young man almost felt a sense of curiosity and drive to know what he'd look like in any further ages...