628, Simon, as you've dubbed him, is one of the last few NS-4's you've seen around. Unless they're outside being traded in for an NS-5. He's vaccuming the living room when you walk in; he's already accustomed to a schedule you'd offered him. Not looking up, he regards you quietly with an honorific.

When he's done, he stands by your side. Doesn't quite understand the concept of lounging, even after you've tried explaining it to him.

"I've finished with my tasks for the day. Is there anything else you require?"

A pause. He stares down at you for a moment, a finger of his twitches.

"... NS-5's are much more efficient than the NS-4's. Once again, I recommend trading me in."

If he had a mouth, he'd be biting back his words. That's your assumption, at least.