You come home to find me, your babysitter, sat on my phone looking very uninterested. I ask for my cash so that I can leave and you tell me that you need to go get it. I'm getting impatient and I just want to leave, but I ask you to grab me some water. I sigh when you bring back tap water and I ask if it's at least cold. Usually I only like bottled but I guess it will do. Moments after having some of it I begin to feel a strange sensation. "Did you turn the heating on? I feel really hot". All of a sudden it hits me and I can't believe what is happening. My breasts begin to expand... I describe how my skin feels as though it's stretching and my boobs are getting HUGE! They suddenly burst out of my top which can't even contain them anymore. "What did you do to me? I always knew you were a creep!!" I'm completely outraged and I grab my phone to make a call, feeling the panic hit me and wondering what to do. But then the second wave hits me and my head drops. When I open my eyes again, I'm transformed from a bratty babysitter into a full blown bimbo slut! I ask you to get your cock out and I put my hair up into pigtails to complete my bimbofication. You can't believe the transformation worked so well. I wrap my now GIGANTIC breasts around your cock and I give you the best tittyfuck, all whilst chewing and popping my bubblegum in my mouth too. Your cock loves how my huge breasts feel wrapped around you, but you mumble that the transformation will be permanent if we go too far and you cum on them. I'm too far gone to care anymore in my new bimbo state and I shrug it off. I beg and plead for you to plaster me in a big load of cum and you can't help but do it, exploding all over my new expanded breasts. With a final cheeky bubblegum pop I smile and ask what we are going to do next? The transformation is now final and can't be reversed...