... to make sure everything is chosen on-the-spot, nothing predictable. It would have been even better had she waited until 11:30 AM tomorrow to ring and ask you, that way it was all a surprise.
Accepting her offer, you hang up the phone, and reflect on your wild ways - you like everything to be different, random. It was just in your nature. Most of the time you had to repress the need for action, randomness, unpredictability. It was the only way you could hold down a job at all, after all. But whenever you had a chance to act on your wildness, you took that chance.
Turning around, you see the mask sitting there still, taunting you. You glance at the clock, and figure that you have enough time to get to the fountain for the impromptu rendezvous, but won't be waiting TOO long. And so, you walk over to the mask again, and pick it up.
You spend just a moment admiring that fine detail again, before flipping it over and looking again at the strangely-reflecting inner surface. Within moments you fall again into the trance-like state that it induced the first time, and your arms inexorably raise the mask towards your face. The mask keeps raising up, up, up, until it's just centimetres from your face...
Suddenly, the mask jumps out of your hands and onto your face, sticking as though it had a mind of its own. You feel the mask melting around your face, fitting your face's form, and at the same time, you feel a strange presence building up inside of you. You struggle, both physically and mentally, and you start to feel your body changing.
You feel your neck grow bigger in all directions as your chest inflates. Your shirt disappears, melting into your skin, and your pants suddenly become tattered and torn, while your underwear simply vanishes. Then your arms grow longer, the biceps larger, the hands much larger and hairier. You feel hair sprouting, quicker and quicker, from your back, until you're covered by a thick pelt of body hair, thicker than the most hairy "bear" type man, while your back muscles grow huge.
Your legs start to grow bigger, but shorter, your shoes disappearing as your feet swell to enormous size, your big toes separating from the rest of the feet to look remarkably like thumbs. You hunch over as your shoulders and pectorals develop thick strands of muscle, and you feel your penis straining against the fabric of the tattered pants, making a visible bulge down your right pants-leg. Your abs push their way out of your gut, and you feel your arse muscles tightening as some unknown force pushes your centre of gravity forwards, making your knees bend and your knuckles drag on the ground.
The presence starts to dominate your mind, as you feel your brow grow heavier and your face become hypermasculine. The mask completes its coverage of your head, and suddenly you become that other presence in your mind.
Opening your eyes, you glance quickly at the mirror not far from you, and observe the green plastic-looking mask covering your head, your entire body looking positively ape-like, but still human, and overall, everything looking exceptionally wild. All of this observation happens in less than a second, and you start dodging around the room, unable to stay still, creating a huge mess of everything. As you do so, you rapidly mumble strings of sentences, basically saying anything that comes to mind.
As you make your way haphazardly back towards the shiny black box, you spot the note, and dash over to pick it up. You are surprisingly still for a moment as your mind absorbs again what it says, and your tongue grows until it hangs significantly out of your mouth, drooling all over the card. You glance up at the clock, then start dodging around towards the door, unable to even move in a straight line - too ordinary for a wild child like yourself.
As you dodge towards the road, you have an idea - without missing a step, your lower body twists and rotates until it takes the shape of a motorbike - perfect for one such as you. You grab the handles (which happen to be your testicles) and twist as the penis-motor jumps into action, and you go flying down the road at significant speed. You don't head straight for the park, though - you take the longest route you can think of, and keep randomly changing your path.