“I have my sources." Somehow, saying I'd heard it from my mom sounded less cool. "You've decided, right? I mean, it sounds like a good deal, seeing as she's going to give you fringe benefits..."
He gave me a level look. "What happens between her and me is none of your business," he replied crisply.
...
Dimitri arched an eyebrow, then jerked his head back where we'd come from. "You hang out in his room a lot?"
Several retorts popped into my head, and then a golden one took precedence. "What happens between him and me is none of your business." I managed a tone very similar to he one he'd used on me when making a similar comment about him and Tasha.”