While looking at "himself" in the mirror Sam noticed that "his" shirt was shrinking around "his" stomach. No "his" shirt wasn’t shrinking "his" stomach was growing. "He" watched as "his" belly expanded to gigantic proportions and felt how heavy it was becoming as it grew in a few moments "he" had gained a 9 month pregnant belly. He ran "his" hand across the huge ball that was now centered in "his" stomach. Looking back at the mirror "he" saw a very pregnant woman looking back at "him". "He" knew if "he" was going to get out of this "He" was going to need Dean’s help so "he" left the bathroom to find him.
Every step reminded "him" of "his" current condition. "His" new breasts bounced all over the place and the more the bounced the more the fabric of "his" shirt bothered "his" gigantic nipples. "He" tried walking normal but the belly was causing "him" to sort of waddle
When "he" finally got back into the Bar "he" noticed Dean was also changing "he" quikly waddled over to warn "his" brother. Looking at the bottle of beer Dean was drinking Sam saw the brand name...