First thing Julien looked for was a pair of underwear. Might as well get something on before trying on pants and shorts. He dug around and found what looked like men's trunks, dark purple. They did seem a little off, the fly was smaller than expected and they were seamless, which isn't normally a design feature of men's underwear. "Oh well" Julien thought, if it doesn't fit I can get rid of it.
Julien stepped into the underwear and pulled it up around his hips. To his surprise, it was super comfortable. Very soft on the skin, tight but not too tight. There was a mirror on the inside door of the and he look at himself in it. Julien was seeing now there wasn't a pouch built into the front as he could see he junk clearly outlined. But it wasn't uncomfortable just a bit tight.
Julien also felt the leg straps of the underwear riding up his butt cheeks higher than any trunks he has worn. He turned around to, putting his back to the mirror, to get a better look at his rear. The underwear curved around his cheeks beautifully and may even be making his butt look bigger. "Alright, these underwear aren't that bad. I could get use to these."
He turned back forward to face the mirror, but as his eye looked over himself again, he was startled by what he saw, or didn't see. Right between his legs, where he had just noted how his package was, is now flat. He quickly pulled down the underwear in a panic and saw he now had a pussy instead of a cock and balls. "AH! WHAT THE HELL!!" Julien shout as he stumbled backwards. Julien fell backwards onto his bed and as his butt touched the mattress he immediately realized his butt and hips definitely got bigger too.
Julien sat there stunned, just staring at his new pussy and hips. As he sat there coming to his senses, he watched as his hips began to shrink and his pussy fold out and become his balls again while his clit grew to his penis.
Realizing he might be safe, Julien began to think. "Am I crazy or are those magic underwear?" He got up and picked up the underwear carefully looking for a tag. He saw a label printed on the inside "CK boyshorts". He picked up his phone and searched it.
After a bit of searching he learned that a type of woman's panties are called boyshorts and these are a pretty common brand of them. Julien put his phone down and looked back at the underwear, "what to do with you"