Jake had heard that the girl he has a crush on will have as a costume but that while looking through the costumes he yet hasn't found the one his crush was going to wear.
It was after looking at the third rack he found the same one as his crush. It is a Old English Sheepdog but he didn't realize the suit was actually a bitch suit. He then takes it up and purchases it.
Then he realized that he was gonna be late and arrived and he then asked if he could change in the bathroom. Which they said yes he then goes into the bathroom and strips off all his clothing because he was told that the costume has it so a person doesn't have to take the suit off before using the bathroom.
He then slips his legs in and noticed that there is a tube for his penis so he can piss. He had gotten the suit all the way on except for the head area and he gets it on and once the suit is complete he then puts his clothing and other stuff in the bag but it was when he then noticed at the bottom of the bag looks like a purse.
It was when he had pulled out the purse that inside it was a booklet that gave the info. It goes onto saying that this is a female Old English Sheepdog and that all also says that you should not wear this for more then 5 days otherwise it will cause a person to take on traits from the suit.
Jake then found that in the purse is a collar and it now says Jessica. It was at that time that someone knocked on the door saying that they need to use the toilet. He then finds that the collar has a switch where it says Anthro or full. Jake turned it to Anthro and the fur had seemed to become a bikini that covered his breast and groin area and then he grabbed the purse and bag and goes out to the party.
It was when Jake sees that his crush had her costume on that he noticed that she was wearing a anthro costume also but that her's was a male version.