Here let me make a few adjustments said Sean.
He took Dan's memory of Steph away. It was built into his reality that no girl would ever love him. Once when he was a muscle stud girls fell allover him but then he got complacent and started getting fatter and fatter. Still thinking that he was god's gift to women no matter how big he got. But the girls eventually stopped looking and when he hit close to 500 pounds of pure blubber would get revolting looks from all women. Sean made all these adjustments to Dan. And that was when Dan met Sean. Now Sean was a feeder and wanted Dan fat and he kept all those transition pictures plastered over their house. Showing Dan when he was a muscle stud. Goring to a slight belly to dad bod all the way through to his current size. But that was when Jay came into the picture. Sean wanted Jay to be fat too. But he also wanted Dan the straight man that can't get a woman with the tiny penis that can't escape his fat pad even hard to only gain sexual gratification through butt sex and that was were he and Jay came into place. He gave himself a fairly large penis but nothing too huge but he wanted Jay to have a massive three and a half foot penis that was as thick as a 3 liter soda bottle. But it will fit into Dan easily. Now Jay was that muscle stud that Dan was but he made Jay pliant to his own coercion to fatten him up and soon Jay was putting on significant weight. And Sean wanted to get them to be the same size and see the two behemoths have sex together. And within a year Jay too was as big as Dan. And Dan continued to grow. Being straight he didn't like having sex with Sean or Jay but he needed that sexual release so he reluctantly participated and he got very use to it eventually needing one or both. Dan would waddle around town having a job at a fast food restaurant which enabled his gain. While he made Jay a garbage truck driver. Jay would come home reeking to high heaven but he wouldn't shower till he had his way with Dan because Sean made sure that just seeing Dan's fat body made his sexually ravenous.