elxcomplete - Mistress Nyx - Military Shrinking Experiment

You've been selected to be part of a new military experiment where they are trying out anew injection that will shrink you but give you invulnerable powers. Your Sergeant Nyx administers the serum into your stream and you soon feel the effects as you slowly shrink down to a few inches tall. At your new height your now giantess Sarge tells you this is where the experiments will start. She needs to make sure your body has also taken on the invulnerable parts as well. She starts by pressing you under her shoe and notices how well you are handling it. She slips off her shoes and tries to go harder with her barefeet. You are holding up well as she cranks up the pressure. She picks you up and tries biting on your limbs, suddenly your arms bites off - you realize the effects are wearing off and your body is no longer invincible. The end will come soon as she flattens you under foot!