Zero is perfectly happy to let Hiro lean on his nose. They can closely study each other! The feel of another person stepping on his foot will have him reaching to very gently scoop up Sam next.

"Human...I can't say that I have. Frankly, before seeing all of this I'd have sworn organic life larger than a microbe was scientifically impossible." He seems a little sheepish at the admission, but hey, he's not ashamed of being wrong, that's science!

Aww, hey, don't be nervous. He gives Hiro, and Sam, a reassuring grin. "I make it a point to be careful with anything or anyone smaller than myself. Though, do let me know if I do start getting a little rough, it won't be intentional."