You quietly look over the costumes, one by one running through them in your mind. You think a little one what to do, remembering the your girlfriend took the fox costume in the other room you think it would be funny to dress up in the vixen outfit.
You read the instructions on the costume for how to put it on and you strip so it will fit properly. You start by slowly sinking your legs into the costumes having to make a slight effort to begin with to fill the slender legs. Finely you get it put on up to your waist and slip your arms down into it as well. You pull the zipper up on the front and sigh a little the costumes chest feeling a little tight. Finely you bring the hood up over your face and start to adjust it so you can see out the eye holes.
As you adjust the mask you start to feel a tingling sensation washing all down the front and back of your body. You stare in surprise as the chest seems to swell and gain weight, though the tight feeling vanishes as the breasts grow to a large c-cup size. You read a hand to touch the now heavy orbs and can't help but gasp as you feel the pressure of your fingers on the sensitive flesh of your breast.
The tingle washes over your groin now and a pleasure shoots up through your spin causing you tail to swish about with life as your cock begins to pull up into your form, the bulge where it pushed from the costume vanishing as your sac draws inward, and the now very noticeable folds of your pussy show through the fur.