They’re near enough in height that it’s not clumsy to fit together, but Neil’s still just a little bit taller. That’s less important, stretched out underneath Steve. He wiggles a little, moves until they fit together neatly—or maybe just because it’s a point of friction and he wants to see how much he can work this other boy up, wants to see where the boundaries are. Kissing another boy is one thing, after all. Neil’s distinctly aware that he’s the more practiced party here, when it comes to what two boys do with each other beyond kissing, because Steve’s admitted to that.