His eyebrows lift a little with surprise when she suggests that he meet her sister. Derek knows how much Prim means to Katniss and the prospect of meeting her had really always been there, but when Katniss says it out loud, it speaks volumes. It means that Katniss trusts him enough to meet her sister, but moreover, it means that Katniss cares enough about him to think he ought to.
"You told her about me, huh?" he asks, also surprised. He'd sort of gotten the idea that this thing between them was quite literally between them and that the only outside people who knew were Alcide and Buffy and only because Katniss comes to his room and they'd both lived with him when it started. "I believe that. She sounds like the kind of person that's hard not to like," he replies. "Whenever you want." If she really wants and she hadn't just blurted that out by accident in the moment, anyway.
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"You told her about me, huh?" he asks, also surprised. He'd sort of gotten the idea that this thing between them was quite literally between them and that the only outside people who knew were Alcide and Buffy and only because Katniss comes to his room and they'd both lived with him when it started. "I believe that. She sounds like the kind of person that's hard not to like," he replies. "Whenever you want." If she really wants and she hadn't just blurted that out by accident in the moment, anyway.