The hallway in front of you looks like a giant plastic pipe. Although big enough to walk down, the moment you enter it it feels like your ears are brushing the ceiling. 'Weird,' you think, looking upwards. 'How can that be? My head isn't even touching it.'
Ignoring the sensation, you start walking down the hallway. Every two metres or so certain sections light up, letting you see where you're going. The lights follow a set colour sequence - red, yellow, green, blue - with only brief periods of darkness in between.
At first the pipe follows a straight line, but soon you reach a series of bends, taking you first left, then right, then left again. With each change of direction the sections of the pipe get smaller, causing you to first stoop, then bend, then finally go down on all fours so you can make your way to the exit. And not only are the sections of the pipe getting smaller, now every time a section lights up a jet of cold air targets your backside, making you jump and yelp and scramble along faster.
By the time you approach the exit of the pipe your butt is tingling like crazy from where the air jets have hit it, and the seat of your jean shorts feels a lot more snug. But neither are unpleasant sensations, and when you reach back to rub your backside a grin spreads across your face. Your ass is now the perfect bubble butt - although you aren't actually aware that it's changed any. "Nice," you murmur appreciatively, loving how big and round it feels.
Clambering to your feet in the room beyond the tunnel, you see straight ahead of you a huge climbing wall, seventeen feet high at least. Your eyes widen as you stare at it, noting that the only way out of the room is right at the top. "Jeez," you gasp, your new donkey ears twitching nervously, "do they expect me to climb that?!"