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You're such a good boy for coming to help me around the house since I have become so fat and immobile, but now that you're here... I know you love taking care of me, helping with groceries, sponge-bathing me, but I have grown so fat that I am in need of full-time care. Maybe you should move in and take care of your big fat blob Step-Aunty and together we can continue to grow this massive body and finally cross that invisible line admitting our attraction to each other and acting on it. No one has to know. It can just be our fattening little secret.