As Simon rocked back and forth on the now human Sparky's cock, he pressed key after key with his ass. The options scrolled by, being chosen one after another. Male, no height change, I.Q's normal, bodyhair normal. Everything was being set at it's current condition, but with one, a huge change. He tabbed over to the weight style option, it scrolled to "Sumo bodytype.", then he was tossed once more on to the actual weight section, his ass falling atop the numbers on the board, changing them each from roughly 198 to 678. With a swipe, the keyboard fell to the floor.
The emitter flashed, zapping each of them without even noticing. Simon was in complete ecstasy thanks to the GBS slider, being lost in the penetration of his ass. Changes began to occur. Simon's abs started to grow smooth, his pec definition faded, his biceps and veins standing out less and less. His muscular quads lost their cut lines, appearing bulkier and bulkier. His current weight showed as 215. The same thing was happening to sparky. His cock shortening as weight entered his groin, it thickened. His ass looked softer, even though it was clenched. It jiggled each time he slammed into Simon. They were both 230 now... a small stomach had grown on each of them, it bounced as they thrusted. Simons pecs had softened, and all tone had left his quads. Hips mounted on his abdomen, a roll gently growing on top of it. Sparky noticed the fat squishing through his hands on Simon's side, but didn't care. His own stomach creased suddenly and drooped down onto his groin. Being 270 pounds, they both began to tire. They were getting out of shape but didn't notice.
Simon's gut grew and grew, slowly sagging down onto his cock. He could feel a pressure there, but was too preoccupied to look down. At 350 pounds, sparky was having a tough time supporting his fattened master on his rod. Simon's growing ass had slowly inveloped Sparky's shrinking cock, now it wasn't visible at all, and Sparky was thrusting into the cushiony flesh surrounding his pride and joy. Large breasts had formed on the two men, they heaved and bounced as they grew away from their swimmer builds. 400 pounds came and went. Simon's cock and balls were now trapped between his own monstrous gut and Sparky's. Each thrust brought them a few more pounds. Soon, the 450 pound Simon could feel the pressure of his balls trapped in the fatty vice. He could feel the fat on Sparky's sides piling on top of his own thighs, but he couldn't seem to fight it. He opened his eyes to see the full 510 pound force of his own new body and Sparky swelling. He gasped, flailing slightly. He moved his arm back to find the emmitter, but they had moved down the table. His huge stomach was pushing close to Sparky's chin, the table was groaning, he was close to 600 pounds, then quickly heavier than it. His balls were being crushed under the heft of his paunch, and sparky was penetrating less and less as his fattened groin and Simon's swollen ass pushed the two apart.
Then, they fell away from each other. Sparky lost his grip on Simon's fat body, they slipped in two different directions. Simon came crashing down on the computer with the astonishing force of 678 pounds, Sparky tilted back onto the emitter, destroying it instantly. There the two lay, stuck as fat, gay sumo wrestlers.
What would they do?