9S is getting a headache from this. Or he would be, if he were capable of getting one. A metaphorical headache, then.

"You're already using Papyrus when you talk to each other," he points out with a pout, slightly put out by the blatant rejection of his and pod's 'names'. "Why don't you just use the same name? I think it's way more confusing using a name that's not you."