I’m sorry I let this sit in my inbox for so long but every time I would try to respond, I would stop to think and just end up scrapping every response I tried making. Still, I would think about it a lot and still do, to be honest.
I too have had the headcanon that it takes Sombra a while to get used to the idea of having a meaningful, non manipulative relationship with anyone, really. For the longest time, she just doubts everyone and their intentions. It happens when you’ve been the manipulator almost all of your life and have had no true friendships.
I can totally see her questioning her and McCree’s relationship, whether it’s real, if she’s just kidding herself or if maybe she’s the one being used this time around.
But it’s just so sweet to think that McCree would take notice of her hesitations and troubles. I imagine that he would care quite a bit about Sombra at this point – he wouldn’t have taken things so far with her if he didn’t care about her. When she does get these small panic attacks, he’ll hold her close but keep talking to her, stroking her hair and quietly reassuring her. These episodes always end with her falling asleep, with McCree shortly afterward. I can see Sombra apologizing to McCree for it the next morning when they’re awake. She says she’s sorry for ruining their time together and being a burden but he always stops her, telling her that he doesn’t blame her in the least and she would never be a burden to him.
He’s very patient with her and she appreciates it so much. Sombra never says anything aloud either, but she considers herself incredibly lucky to have met someone like Jesse, who she deems very important to her. For the longest time, she continuously calls him a friend only, because she’s so afraid that once she cross over into the ‘l’ word territory, if something were to happen to him, she’d never be able to handle it. She loves him, even if it takes her a long time to admit it to herself.