Considering they were already past a point of wanting to stop and Bucky felt committed, on top of wanting to do this more than he expected with the other, he pulled for Loki's shirt to come off and took the moment parted to ask, "How do you want to do this?" It felt like a good question. With Thor, it was a lot of the God of Thunder being concerned for his safety and having him take the control. His brow twitched, trying not to think about Thor while he was undressing his brother. Because adopted or not, this was likely going to haunt him.
Bucky tried to hide his internal cringe and leaned to lick at Loki's lip playfully. "Whatever you want." He wondered if that was often the case. If Loki had partners or was ever given that sort of open wide option to choose what he wanted. The last person he needed to think about was Steve, but he wondered if Steve did that for the trickster god while they were together.