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Artist's commentary
日常のAfter Years
"Phew... finally, all calmed down and sleeping peacefully."
"Wow, thanks, Nano, you're a life-saver... You're really good with kids, huh?"
"Well, I have had a lot of experience dealing with spoiled children... peek"
"!?... h-humph! That was just youthful exuberance! ///"
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The three friends, 8~10 years onward.
Young mama Yukko, grown-up Hakase, and a variously upgraded Nano (mostly her chest, lol).
※Super-speedy in-a-hurry supplementary comment:
When she passed 20 (apparent) years of age, she finally got the screw removed.