It does feel reall good, and Peridot's weird paws are in the perfect spot for her to grind against too. It makes the fact that the gem dragon is basically humping her back a very, very minor realization. One that Lapis can't bring herself to care about?

Also because she's rutting her hips against Peridot's hand hard, grunting unattractively every now and again when Peridot presses said bulge against her lower back.