Your Spit Creates A Monster Futa

Your GF has always found your inclination for her gym socks and feet to be a little odd, but after some persistence from your part she agrees to let you lick her feet. But something unexpected happens when she starts to feel funny and the properties in your spit cause her to grow a futa cock. It appears that every time you lick it gets bigger. To try and get rid of it, you suggest she make it cum. Unfortunately, it only ends with a cumload on her feet and no changes to the size of the futa cock at all. Lured in by the sweet cum on her toes you move in to take some more licks, but she becomes infuriated that you would worsen her situation for your own selfish desires. She stands up, her futa cock now 10X bigger than before, and begins to stomp around. While you scurry into hiding, she has a wonderful idea about what could turn her back to normal - having her cock swallow you whole! But now you need to be lured out, so she uncovers her breasts and ass to entice you out into the open. You become transfixed on her shaking ass and she takes the opportunity to trap you underneath it. You are pummeled and squished under her ass as her new sadistic personality emerges. Once done toying with you, she takes you out and places you onto her cock. You must lick it more, so that it grows further and makes your journey inside her cock even longer and more punishing. Once satisfied she inserts you into her futa cock, and feels you slide down every inch until reaching her balls where you will be digested.