Jake's eyes fell on a leather vest, dark black and glossy. Something about it just called to him, and as he took it off the shelf, Eric flinched. "You're not.. going to put that on? You don't know what it'll do to my body."
Jake fixed Eric with a glare that probably looked petulant on his young features, but it quieted the man down. "It's my body right now, thanks to you. And I'm going to try this on." He practically shook the vest at Eric. Then with a smug grin pulled it on over his shirt. It was a bit loose, but it felt good resting on his shoulders. As if right when it settled on him a wave of excitement passed through him. The tent in his jeans became even more noticeable as his cock turned rock hard, straining against the blue fabric.
He ran his hand across the stiff fabric, pleasure running through him as it rubbed against his hard shaft. Either this kid's body was hung, or else the vest was already having an effect on him. Eric backed away slightly as he watched his old body pleasuring himself.
Jake's clothes, slightly baggy to begin with, were starting to hug his frame. The clothing tight against a firm musculature that wasn't there moments before, every passing moment adding another few pounds of muscle to his body. Even his bones were getting longer and thicker, adding inches of height and building out a bigger frame to hold more muscle. Jake forgot all about Eric as he lost himself in the intense pleasure of his changes.
The cuffs of his jeans were partway up his shin, exposing several inches of his legs. With a tearing noise, the seam started to give way, splitting up his leg to show of a pair of toned limbs, thick with new muscle. The sound of his jeans tearing was nothing compared to the sudden pop of his shoes giving way, his growing feet freed from their confines. Even the sleeves and sides of the t-shirt he wore were starting to give way, flesh becoming visible as the threads strained to hold everything together. Oddly, no matter how much he grew, the leather vest seemed to always be just the right size for him.
The waistband of his pants suddenly gave way, the denim calling away, followed shortly by the tattered remains of his underwear. Eight inches of rock hard meat stuck out from his crotch, a small nest of brown pubic hair around it, his lemon like testicles swinging heavily between his thighs. "Suck it." He heard the command come from him, his voice noticeably deeper. And Eric was fast to comply with the command, dropping to his knees in front of Jake, taking as much of the shaft into his mouth as he could.
His t-shirt suddenly ripped apart, exposing his heavily muscled chest and solid abs. He tore what fabric remained of the shirt and tossed it aside, leaving him dressed in nothing but the leather vest. His abs continued to bulge, pushing outward as they turned from a washboard into a muscle gut. He could feel his face rearranging, sure it was the same face he had gained from the kid when they swapped bodies, only now with a distinct maturity and masculinity added, sharpened and rugged. The curl blond hair that hung shaggy around his head began to shorten, pulling back into his scalp until only an inch of thick blond hair remained on top of his head. As if to make up for the shortening, he began to grow in a beard, blond and trimmed short, but it set of his features perfectly.
Every time Eric bobbed up and down on Jake's cock, it seemed he could take less and less of it in his mouth, though in reality it was simply getting thicker and longer. More of it to take, until it topped out around eleven thick inches. The light brown pubic bush began to spread, a thick coating of body hair sprouting across his body. It grew in thick and curly across his muscular arms and legs, and in a wide strip up his muscle gut. The hair spread out into a thick curly pelt across his meaty pecs, only his nipples visible through the thick hair.
Jake reached up and twisted one of those nipples, tossing his head back and letting a deep moan escape him. His other hand went behind Eric's head, holding him in place as he fucked his hot warm mouth, thrusting his thick cock in and out. He buried as many inches as he could down Eric's throat, pleasantly surprised when he didn't gag on them, even as seed flooded from his laden balls down Eric's eagerly gulping throat.
Jake pulled out of Eric's mouth, splashing the last few squirts of cum across his face, the white cream stark against the black man's face. Eric looked up almost eagerly, though worried. "Can.. can I have my body back now?"
Jake grinned, the devilish smile seeming to fit the new muscle bear perfectly. "No. I think I like this body now the way it is. And I like you the way you are. I think we'll have a good time together don't you?"
Eric looked both crushed and.. excited at the prospect of being this bear's lover. He finally nodded to Jake, resigning himself to the way things had happened. Jake grinned, knowing that this was turning out for the best. "How about I buy you a present to make you feel better, and for sucking me off when I told you to. Pick something."