Brown goo. It lands on your chest and sits on your skin, you stare at it and wait for something to happen. Maybe it's a dud? nothing seems to be happening. As time passes, more of this goo drops on you, until in a sudden move the goo begins to crawl across your skin. The goo drips quicker as it covers your chest in a blanket of brown.
The goo crawls up your chest, as it climbs you see your body being covered in this shiny latex, your features hidden under this rising wave of brown. You feel pressure in your chest, but as you go to stare at your changes the goo begins to reach your head. You open your mouth to scream but only help the latex enter you internally, your screams are muffled as you feel the latex climb up your nose, then cover your eyes.
Darkness. You can't see anything, but you can feel so much happening to your body. Your chest feels heavy, it feels like you're getting bigger. You feel so... empty. Your stomach grumbles, you need something to fill you. Your eyes open and you find yourself on the floor, the bindings in pieces from your transformation. You look over your body, you're big. Your chest heaves with your breaths, you've put on a lot of pounds and fat. Your arms are muscled and hardened, looks like with the size came some muscle. You see a mirror at the back of the room, approaching it you see your face... it's a bear muzzle.
You examine your face until you feel sudden pressure and pleasure, you look down to see your cock rock hard. It's around 8 inches now, but it's thick. Someone would have a hard time with this in them, or a really a good time. You stroke it, and the pleasure is too much. You continue to stroke it, quicker and quicker, until you launch ropes of brown latex on the mirror.
You smile after that pleasure, but your smile is interrupted by grumbles from your stomach, you need something in you. As your rubbing your stomach the door opens and you see...