Gamzee hears that groan, feels it, and keeps up the sucking. He breaks it up by lapping in long strokes with his tongue and carefully nicking the area around it with just the very tips of his teeth before sucking again. After a while though, he's aware that he should be paying equal attention and so he pulls his head away just enough to reach the other side and give it the same attention.

It's hard to pay attention with that wonderful hand on his bulge, and the feel of it wrapping on its own accord around Dave's dick. Gamzee lets loose a high, needy sound, rocking his hips hard forward while his bulge curls tightly and ripples with contractions, almost milking Dave's dick all of its own accord. Fuck, that feels so good, but he wants to be doing the fucking, so he bites down on his lip in an effort to... he doesn't even know.

But the indigo looks so nice on Dave's skin, and Gamzee suddenly wants to drench him in swirls of that color. He pulls his mouth across Dave's chest in a sloppy kiss, hissing in pleasure as the cut stings and indigo streaks.