Question about an interaction between Molly and Lara (light spoiler)

Also a medium-sized spoiler for Peace Talks (I wish we could flair with two books).

Apologies if this has been answered elsewhere. I searched but couldn't find anything.

There's an exchange in Battle Ground that I wasn't 100% sure about.

>>!Lara noticed me looking. “Not one quip about hentai, Dresden.” She glanced at Molly and nodded. “Thank you for the assistance.”!< > >>!“It is no more than is due you under the mutual defense stipulations of the Accords,” Molly replied in a rather frosty tone.!< > >>!Lara stared at Molly carefully for a moment before inclining her head. “Ah. Of course.”!< > >>!Something like real anger flickered over Molly’s face for a second and then was gone.!< > >>!I glanced back and forth between them.!< > >>!I hate it when I miss things.!<

I hate it when I miss things too. Is this just because of the >!simulated sex scene between Lara and Harry in the gym, which Molly would think is real!<? Or something else that I'm just not remembering? I've gone over the short stories and didn't find anything where Lara and Molly interacted.