His nails began to slide across Remus's chest with a little more pressure, as it had earned such a moan from him before. It was of mild difficulty, to push his hips into Moony's so much and still access all of his chest. But his hand tracing scars hadn't fallen too far down. Sirius wasn't sure he trusted himself with what would happen were he to try that. And so his hands were satisfying themselves very much above the belt.
Had Moony not been pulling at Sirius's jeans, he very well may have thought Moony meant something else at that motion, that urging. Sirius would have been quite happy to, actually. But Remus had some sort of idea, and given what the small signs implied, Sirius was very much a fan. So Sirius dropped down toward the ground. But his hands didn't help catch him at all. No they kept their hold, so as to pull Remus with him. And he was grinning oh so well.