This is really racking my brain, I remember reading this growth comic some odd years ago where this guy had a little sister, or it might've been neighbor, that was extremely small for her age. Then she went to a private school i think where she started growing slowly. She eventually ended up being like amazon height and it was because of some medicine she had taken. The story was like double digits chapter length. But it extended to them starting to date and doin. For the life of me I can't remember any important factors from the story to search it, I also thought I might've found it here but I'm not positive. Any help would be greatly appreciated
