Ah! No, that "it" is referring to his chest binding XD Which is why he's grabbing at his sweater in the previous sentence, and why Jon can feel his curves a couple of paragraphs down.

LOL@"Gretchen". Now I'm trying to think what kinds of names Stephen would give to his various, ah, tools. (Maybe he and cis!Stephen and Stephanie should all get their collections together and compare notes...)