Brian looked up at the looming Knight, who grinned down at him, as he loosened his belt. "You're about to experience what the fine ladies of this town know as 'the broadsword', little elf," he boasted. The Knight then pulled off his trousers, revealing a thick, hard cock, covered with veins.
Brian gulped theatrically, although secretly he was thrilled by the sight of what was about to be his. The Knight was thickly-muscled, and quite nicely hung.
The Knight laughed, unaware of the elf's deviousness. He got on the bed, and roughly pulled Brian's ankles over his thick shoulders, getting the elf's ass in position. "You were a bit of a challenge," the big human offered, "but I was the town wrestling champion, as a lad. You never stood a chance." Then, with a satisfied smirk, he rammed his dick deep into Brian's muscular elven ass.
Brian was a bit surprised by the Knight's seeming ferocity. The man was rough - that was for certain. His powerful thrusts left not question as to who was in charge. Brian simply smiled, and said, "Bexoijksr!"
The Knight was so caught up in fucking Brian's ass, that he didn't even notice the command word that Brian had uttered. Rather, he let the feelings of sex and power wash through him, as his pleasure increased with each powerful piston-stroke of his thick legs and powerful glutes. He groaned, and shot his seed deep within Brian. The resulting orgasmic sensations caused the Knight to bellow mightily, as his entire body seemed afire with pleasure. Every inch of his being seemed determined to pump itself into the muscular elf's tight ass.
Brian himself felt the now familiar burn of power, as it flowed out of the Knight and into his body. His back arched, as he stiffened everywhere at once, and he let out a low gasp of ecstasy.
"That...good...for you...too...huh?" panted the Knight, still driving himself into Brian's ass, even as a feeling of weakness came over him.
"Better," Brian pronounced, his voice deeper than before. The Knight looked up, and was shocked to see that the elf had grown. Brian's abs were thicker, rounder, deeper, and harder than before. They led like a cobblestone path to a massive set of meaty pecs, each a huge mound of muscle, and between them a deep canyon. Through that canyon, the Knight could see Brian's smirking elven face, upon which was a most evil expression of satisfaction. The Knight's shock deepened, when Brian casually brought his hands behind his head, causing the elf's immense biceps to bulge and swell with stolen size and power.
The Knight, still uncertain of what was happening, tried to stop, but Brian's now-enormous legs were still draped over his shoulders, a pair of immense, heavy logs. The Knight struggled, but Brian used his huge legs to hold on to the now-diminshed human, his rich voice chuckling evilly. "Not yet, little man," he laughed, "that cock of yours isn't quite done yet."
It was true. The Knight's shrunken dick was still hard. Try as he might, he couldn't will himself soft, or stop cumming. And with each spurt, he became smaller, and Brian became bigger, until finally the human collapsed, utterly spent, his body little more than bones and loose skin.
Having drained all that he could, Brian kicked the Knight's husk-like body to the side, and rose, a towering figure, his body thick with muscle, a huge cock between his legs, resting upon oversized balls.
Brian strode to the full-length mirror on the side of the room, and admired his huge body. The first time he had used the ring, it had been to escape. But in the process, he had discovered that the feeling of gaining muscle was so invigorating, so enthralling, that he had to do it again. He brought up his arms in a huge double-biceps pose, and watched his reflection bulge impressively. Chuckling, he grabbed the bedsheet, ignoring the Knight, who was trembling in the corner. Brian wrapped the sheet around his waist, huge thighs, and impressive loins, forming a set of makeshift pants. Then he strode out of the house, and into the night.