Unaware Giantess Flattens Her Roommates

POV: You and most of your roommates found a weird device that caused you all to shrink down to a fraction of an inch in size! Now no bigger than a common bug, you all head outside to experience the super-sized world. Just when you're taking it all in, your last roommate returns from a quick trip she had taken to the gas station up the road. She realizes she doesn't have her key, so she begins pacing, looking for a way to get inside. Then, she steps on something weird, and begins to stomp around trying to exterminate the pests at her feet! Will she realize what she's done before it's too late? What will she do when she realizes these were her roommates!?