OC #7 Unconscious growth Schoolgirl - Nipnotrans/Accessories Diff (Patreon)

She is running as a relay runner.

She noticed that she was missing the baton stick that proves she is a runner in her hand.

But in essence it is not, and what she needs to realize is that the body is growing with each advance she makes.

How far along in her development will she find that she is growing as she goes?