Watching from my room, I saw that my little brother was a ball of energy after his nap.

Which two things are being compared?

Brother and ball of energy

pugs suck ngl

Brother are crazy

why are we talking about pugs lol

pugs do suck ngl

we've been spending most of the time living in a pug life.

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i like pugs

In the sentence, the two things that are being compared are "my little brother" and "a ball of energy". The speaker is describing their little brother using the metaphor of a "ball of energy" to convey how lively and full of energy the sibling appears to be after waking up from a nap.

pre-nap and post-nap behavior