How about Donnelly/Everyone. That cool? I think that’s cool.
Carter doesn’t notice it until he actually raises his voice, and she is just as surprised to hear him do it as she is to notice the effect it has on her - there’s something rough and rasping that shows up behind it when he’s passionate about something and she keeps her questions about how it might sound in other forms of passion to herself.
Szymanski notices it right away, not meaning to overhear, but he happened to be sitting just behind him when it pushes into his awareness, and Agent Donnelly is on the phone and giving clean, clear, low commands that he might not mind having directed at him, if there were just a little more interest and husk in the tone.
Reese realizes it when they’re both sitting in the same room, under the pretext of interrogation, and if he lowers his own tone into a curling purr just to see if he can draw that out of the Agent in turn, well he’s been sitting here a long time and this game of cat and cat could stand to be a little more interesting.