Oh. So, apparently, male nipples are good for something. Dave groans around the horn in his mouth, tightening his grip on Gamzee's hair. He reaches down with the other hand to grip Gamzee's slick bulge, running his long fingers over the bumps on the surface, pinching the tip with every upstroke.

His hips rock forward, and that's all right, too - there's plenty of fluid down there to keep the friction to pleasant level, and he readjusts his grip so that he's stroking both Gamzee's bulge and his own dick, letting Gamzee's bulge writhe against him and wrap around him however it wants to.