"Heh, that's what I named my, uh, abacus."

That gets an involuntary chuckle. "Abacus Marcus, or Marcus Abacus? Very important, see." 

"It doesn't have two names. It's just Marcus, an abacus."

"Ah, I see. Well, there aren't that many named abacuses in the annals of history. So Marcus needn't worry about being unambiguously legendary himself." 

"I think most of the other kids in the abacus class named theirs too as a best practices thing but I was first to announce it so probably none of the others are also Marcus."

"Ah, abacus class, of course. They always seemed a bit awkward to me, but in here it sure beads the alternative." He delivers the line with as straight a face as he can manage. "I hope Marcus is a tool you can count on." 

Sean actually giggles at the joke.

Haha! Success. Alexius seizes the opportunity to polish off breakfast.