Jake couldn't believe what had happened. He had screwed his buddy Ben, because of some damn Chinaman with his magic panties and magic potions. Ben was gone now but Jake and Ben could never forget it... and Ben didn't even have a way to change back.
Jake went to his shower and turned on the water. Nothing happened. "Damn pipe's finally broke, I bet." Quickly, he got his clothes from the other day and put them on so he could go outside and look at the pipe. He wasn't really looking at what he did and it only occurred to him that he had the wrong item when he felt the wrong kind of fabric.
"This isn't my underwear!" he said.
It was the magic panties and he already had them half up his legs. But something about them made him unable to stop putting them on halfway. He pulled the panties up to cover his crotch and felt his dick shrink and a hole develop between his legs. Then finally he was able to take them off, leaving himself with a pussy very much like Ben's.
Jake put on his clothes and went out to fix the pipe. Some wild creature had gotten to the water pipe and knocked it completely out of its rusting joint. There was water spurting all over the place. Luckily it was still usable and Jake only had to put it back--he was afraid he'd have to buy a new one.
Jake took his shower, idly fingering his pussy and wondering how to get out of this mess now....