"I know." It was a reassurance that Prim was listening, that she was watching. That she could see that it was real from her sister's voice, her expression. She didn't know everything, wouldn't until and unless Katniss spoke about it, or other people did, but...

For Katniss to say she was with someone, to Prim, in the sanctity of the bedroom with no cameras watching or people listening in?

It had to be real.

"And if you ever want to tell me about it..." She'd listen.

But she wouldn't make Katniss tell her.