The door handle is pulled from his hand with the gesture, and Bucky flinches back with surprise.

"Er. Well, yeah, but there's nothing wrong with being polite about it." He thinks, anyway. It's also habit, really. Loki invited him, sure, but one should still be invited in, especially as they're still just acquaintances.

At any rate, Loki's made it quite plain he should walk on in now, so he does, looking about curiously as one is wont to do. "Something happen?" To make Loki feel as down as he is. He'd thought to ask while they were still texting, but it seems more appropriate to ask in person.