The Extremely Happy Time Machine

Previously

…As Professor Pip finally declared their return complete and began to meticulously clean a smudge of cake frosting from a vital capacitor, Lily carefully folded her parchment and tucked it into the pocket of her adventure-worn overalls. She wouldn't show him, not yet. But as she followed him out of the time machine, her mind was already a bustling workshop of her own making, filled with the clatter of new ideas and the promise of a future filled with her own brand of invention. The Giggle-Generator 3000 was just the beginning.