When you woke up you looked down from your bunk bed to the computer, and found that Emily was still on the computer and was... Topless, and you could see her breasts even though you were looking at her back. Emily must've heard you rising and look as she turned around letting you see her Massive breasts that were currently resting on her lap. As you stared at them Emily giggled and said "Enjoy the view of my two girls here? There was a program on the computer somehow that was able to change things. So I decided to try this... Although as much fun as it was I should shrink these things." she turned around and typed a few more things on the computer and you could see her breasts shrink out of view. Turning around her breasts were now probably an E-cup. She then saw you up on your bed and thought and said "Oh I shouldn't be too greedy for myself. I'll get you something. Then turned around and typed something into the computer.
Leaning over the bed your nipples started to feel weird and tingly. Looking at them they started lengthening from centimeters to an inch as flesh started to pile under them. Your underdeveloped breasts were developing extremely fast. As you tried to pull your top half back you found your breasts had grown too large and your 4 year old body wasn't strong enough to pull them back. You ended up falling down boob first, and while you couldn't call it painless your breasts absorbed most of the fall. It still hurt a lot, but at least you landed on two beanbags worth of soft flesh instead of breaking a bone. You started to cry.
Emily somewhat unsure of what to do tried to comfort you, and then thought of something she could try and...