It travels here, there,
everywhere,

and is a place
when paired with nine.

It’s one cool customer,
to be sure,

but with a warmth that is sublime.

It’s a Pro,
but no need to pay.

Under or over —
it swings both ways.

Two are upperclassmen;
the other likes to party.

One by one or in a group,
in either case it’s hardy.