"Can't go wrong with foxes!" You say now getting over your shy-ness.
"That's the spirit!" The clerk takes an orange pelt and tosses it too you.
You hold out the fur in front of you. It looks like it was skinned from a real fox, and in fact it's the size of a real fox. However, the six inch cock (which is proportionally is pretty big for a fox) does not follow the same pattern. You also find a zipper down the back of it. It almost seems out of place on the hyper-realistic costume.
"Are you sure this'll fit me?" You ask.
"I'm positive. All our costumes are one size fits all." grins the clerk with a twisted smile.
You pull on the costume, it doesn't seem to strech at all. "You sure?"
The clerk now gets serious all of a sudden. "We're 'The Second Skin'. These things aren't just costumes, their second skins. As you wear it, you become it. Go ahead, try it on!"
"Okay..." You pull the zipper down and step into the costume. It feels a little un-nevering. Your legs seem to shrink as you pull the costume up to your waist. Suddenly, you feel a pang of pleasure as you feel your penis insert itself into the costume's condom cock. The thing is, you were wearing pants under the costume. You stare down at it in amazment as you feel the clerk come up and pull the costume up to your shoulders and you automatically put the arms on. Finally you pull the mask up over your head still mezmerized by what you're feeling. Then you take a glance at the mirror on the far side of the room.
You see a small three foot tall fox balancing on his hand legs dealing with an increasingly large errection.
"HOLY CRAP!" barks the fox, err, you!
"I thought you might like it." boasts the clerk.
"I love it!" you pipe out as your paw slowly drifts south.
"Woah, hold on their-" It's too late, you're already full on masturbating.
The clerk shakes his head. "Stop! There's a little problem with these costumes. Here, take of the costume and I'll show you."
You remove the costume. When you get down to the waist you hear a tearing noise however. Looking down you see 1) your costume has a hole where the condom used to be, 2) you're still wearing the condom, 3) your not wearing any pants!?! and 4) you're not actually wearing the condom anymore, you've got a fox's penis!
The clerk sighs, "These costumes knock up the sex drive. But, that makes you a little too much like the second skin, and it starts to become your first skin. Don't worry, the cock always seems to transform. Just don't masturbate and it'll wear off in a day, though to be honest most people like to keep it for a few weeks after they rent the costume. As for the rest, any sex is fair play for transformations, oral, anal, female..." The clerk winks, "Male?"
You dash out into your car a few minutes later with a pair of loaner boxers. You can't wait to show Jack your costume. Driving home you don't know what to expect.