Random frostbek thought, (or any Frost ship really but I’ll use Frostbek as the example)
You know how cats have this reflex where if you scratch them for too long they might instinctively scratch or bite you? it’s not malicious from what I’ve gathered it’s just a reflex called petting induced overstimulation.
So what if tabaxi have that?
Just imagine Torbek finally getting he physically touch he craves, the two cuddling comfortably but then Torbek try’s to return the affection and brushes his claws through Frosts fur only for Frost to instinctively slash his hand away.
Frost feeling incredibly awkward and shameful because he’s supposed to have better self control than that (if you want extra angst points maybe add additional lore of the cult he grew up in forcibly trying to “correct” that instinct of his through not so kind training sessions) also him worrying that he hurt Torbek.
Meanwhile, Torbek is either worried he hurt Frost by accident or starts to feel worried he did something to upset him or maybe that instinctive reaction from Frost triggers a fight or flight response in Torbek due to his PTSD and the situation gets worse for both of them.
There are probably many ways you can take this but that’s all I’ve got for now, enjoy.