"Pollen." Perhaps he'd been off by himself one too many times in this place, perhaps he figured he was just restless from his last visit to talk to Cybertron. Whatever it was...it certainly didn't feel like a medical condition.

Not until dust--no, pollen--is vented from his wiring when Ratchet puffs air.

"I...I've noticed some changes, certainly. I'm..."

What's the word he's looking for.

"Excited."