He watches Bucky curiously as he sets his stuff aside, eyes flitting from the paper to Bucky's face as if not sure what to expect. Like he didn't expect him to just go all in like that. Of course, he's pleasantly surprised because while chaste is nice and all, the 'proper' way to do it appeals to him the most. Never really one to half-ass anything unless he's forced to, this is ideal.

So as he watches Bucky lean in this time, his eyelids lower a little in anticipation and eases into the touch by tilting his head in to match. This feels good, and he's glad to see that Bucky is not a bad kisser in the least. Wanting to see how much he can get away with, he parts his lips ever so slightly to draw the kiss in a little deeper. He doesn't use any effort on his part, just naturally letting the weight that Bucky puts forth to do so.