Lily wanted Neily to grow already so she thought of something she could do. she told Neily "guess what?"
then Neily groaned on the inside thinking "what is it this time, isn't me being a baby girl bad enough?"
Lily said "The doctors told my my breast milk is filled with a lot of nutrients and estrogen so you develop faster when you drink it. In fact from suckling my boobs you might get some yourself, and aren't you a little thirsty?"
Neily did start feeling thirsty and looked to her x-sister now mother's breasts for something to drink and Lily happily obliged by opening her shirt and exposing them. Neily said "You know I had a friend of mine tell me about how big they were and called me something. Oh yeah Ms. J-cups or something." Then somehow her breasts expanded quickly to J-cups and filled fully with milk and Lily said "Well drink up." then put neily to her breasts, and the young baby suckled and drank. As the girl drank her body expanded and grew older and older and soon her body was as old as a 12 year old girl and when Neily recognized this she got off of Lily's chest.
Neily said "Lily turn me back right now!"
Lily asked "what on earth do you mean? Are you perhaps reciting lines for that school play? I mean you were born as Neily and shouldn't know anything about any other life." Neily then forgot about the time that she was Neil and Lily said "So we got some of the tests back from that doctor's check up."
Lily asked "anything serious?"
"kind of, remember when I told you my breast milk had a lot of estrogen in it and some of the birds and the bees?"
Neily nodded and Lily continued "well it seems that thanks to you drinking a lot of that milk your going to develop fast and grow really big."
"Well are there an-" Neily stopped and put her hands on her chest as she felt something and then when her strange feeling was gone she took her hands off her chest and saw small A-cups and really pointy nipples. Lily started overall developing everywhere else as well from her groin to her hips.
Lily said "At least your cute cothes didn't get torn" as she realized that Neily wasn't actually wearing anything and neily got clothes that while tight weren't gone. What happened next?