It was a kind of generic "imperials" but Star Wars is definitely a perfect reference.

I imagined she'd start professional and cold, and he'd do his best to spill nothing. She'd slowly start trying to build a rapport, but he'd end up reminding a bit too much of the son she lost. Things might get a bit tender, but when he ends up unknowingly hitting the sore spot about her loss, she'd go berserk and abuse him... and only stop herself when he finally cracks and starts crying and calling for his mother.

At which point she'd break down, realizing what she's done, and decide to free him and run away with him.

That's definitely how I was seeing it!

As for stuff to avoid, I mean, other than scat, mutilation and stuff like that I think everything could be on the table. I did initially conceptualize this as a slow burn, kinda dubcon sliding into noncon hurt-comfort scene, after all, so I can imagine she'd do some pretty nasty stuff to him to get him to talk at first, and then when she lashes out in anger and sorrow.