Bucky feels like he's been kicked both mentally and physically when Wanda starts telling him to stop and when he pulls away, he looks at her with concern on his face and he knows his right hand is trembling. What did he do? What did he do? For someone who hasn't had his body autonomy for a long time, he's afraid he's taken something from her.

"Wanda, I'm sorry, I thought I was doing what you wanted...I don't know what I did wrong but I'm sorry. I didn't mean to. Did I fuck it up?"

Shit. How is she going to trust him when he's clearly crossed some kind of boundary with her that she didn't want him to cross? He had only wanted to be intimate because he loves her and wants her to feel good but now he's afraid he's fucked it all up.