You decide to go out and look for another horny guy. You stand up and reach for your boxers. Thankfully your new vulpine figure is still just slim enough to fit in them. After easily putting on your shorts and shirt, you realize that you've barely grown. You'd just gained muscle. However, since your legs were digitigrade now, there was no chance of putting on your shoes again. With your now padded feet, the shoes wouldn't be necessary. You practice walking around on your toes, noting how odd it feels, and after being able to balance easily in your new stance, you exit the changing room.
You are about to exit the building, when you, for no reason, decide to look back over to the fox costumes. You spot a man, about your age checking one out. You gasp quietly. This could be your chance. You go into the next aisle to be less conspicuous and walk over to the costumes, watching him from a few dozen meters away.
He takes a costume off of the rack. It looks almost exactly like yours, just a lighter, more yellowy shade of orange. He examines the costume, in much the same way you did. He, however, came with a more determined conviction and seemed to know exactly what he wanted. You see him nod to himself and he begins to walk over to the fitting rooms. You follow behind him, your padded feet making silent footfalls, all the way to the fitting rooms.
He enters a fitting room and doesn't even bother with the door, as he is too busy looking at the dildo suctioned to the floor. You just realized which room he'd stepped in, but then you realize he isn't walking out disgusted. He instead leaves it on the ground and turns to the mirror to look at himself. That's when you see a bulge in his pants and can't take your eyes off it. He takes off his clothes still facing the mirror. His frame is slim but athletic, less so than yours though. He, unhesitatingly, takes off his boxers, revealing his penis. You feel your cock harden and press hard against the fabric of your shorts.
You wanted to go into the room with him, but the idea of watching him transform without him knowing was tantalizing as well...