You slide down Buster's paw and land gracefully on the ground. Apparently weighing less means falling is less of a threat to you. It feels as if you're moving slower through the air, kind of like sinking in breathable water. You wonder if this is what it's like to have gills.
Once on the ground you start your loooong trek to the doorway. You're probably only about a centimeter tall. The bare floor of your bedroom seems greatly textured; each crack is shallow enough to traverse, but still a groove or gutter to you. Buster keeps sniffing around the room as you slowly and gradually make progress towards the door.
After a couple minutes, you feel a little strange, almost as if someone is watching you. You turn around and realize that Buster is looking directly at you. It gives you a little nervous flutter, but you dismiss the possibility as you're just too small. There's no way he could spot a centimeter-tall bug.
Even so... you feel safer standing still. Until Buster starts walking toward you. Even across the room, the giant canine is directly over you in a second or two, his massive paws stepping down in front of you, his hind paws behind you.
To your surprise, he starts lowering himself to the floor. This also takes only a second and before you know it, you're in the shadow of his hindquarters, a natural cave formed along the upward curve of his rear end with his humongous sheath staring you down.
Then, as if on command, Buster starts getting an erection. While normally this might be cute or mildly disgusting, you're literally small enough to fit inside his urethra. This colossal penis is growing big and it's starting to take up what little room you have. To either side, Buster's legs block the way. His gigantic testicles prevent you from sneaking around his cock, and you're backed up against his belly. Things are not looking good.
