Dark super girl has defeated you in battle. You wake up to find yourself bound and at her mercy. She has a use for you and you have no way of backing out. She has crafted a new substance that can give her immunity to all forms of kryptonite. Her body absorbs it slowly over time through her nails. It can be used in plain site as a fingernail polish or in this case in seceret - beneath her boots. She needs to test the durability of this creation and so she needs a lab rat - you! You'll be using your mouth to do your best to lick, nibble and suck away that coating form her toes. How long do you think it will last before she knows your secret foot fetish? Maybe that's why she picked you in the first place. Perhaps she'll even reward her new lab rat with some pleasure of his own to ensure he keeps up the good work...