She suddenly starts gaining height. Not a lot, but enough to create a significant difference between the two of you. She also becomes more mature looking as she ages up at least 10 years, landing her somewhere in her late 20s. Her breasts also nearly double in size as her areolas darken.
Even as a fully grown adult, you find her to be beautiful. She puzhes you down onto the bed after walking you back into the room. Her is head nearly touching the ceiling as her nearly 7 foot tall body maneuvers around the lights and fan. She then sits down beside you and pulls you onto her lap as she releases her right boob from her now very stretched out top.
With a mischievous grin, she pushed your face right up against her boob, aligning her nipple with your mouth, which you do not hesitate to latch onto. "So, if you want to be a diaper girl, I guess that means you need me to feed and care for you. Also, I may have been a bit too over zealous when I made them this big, but my boobs are now completely engorged with milk. Now be a good diaper girl and drink it all up for me. And if you manage to drink me dry, I may have a big surprise for you to suck on afterwards."
You didn't know what she meant by that exactly, but then the sudden presence of a rather stiff object poking you in the back was giving you some pretty big hints. It is only now that you realize that you have been non-stop suckling out her milk even before she started talking about it. You also are feeling her free hand begin unfastening your diaper as she slowly slides a few of her fingers under your nighty and into it.