De-aged Kirk

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Looking for this fic which I read a while back.
The significant part that I can remember was a de-aged Kirk was given a stuffed toy by Scotty I think... He went wandering around Engineering, and everyone was in fear as he crawled really high up, and was in danger of falling onto some electrical field or something? In the end, it was the toy that fell, and unfortunately met its demise. Hahaha...