He wasn't expecting such a request, which in hindsight was probably a silly thing to not expect Karkat was a rough troll it's only natural he'd want a rough touch. Either way he complied biting down hard, he was a bit hesitant to do such a thing not exactly eager to hurt the other but the moan that follows is enough to keep him going. Karkat whines and dips his hips down certain that he wouldn't be able to keep up the soft touches much longer, but when John bites down it's like a little slice of heaven and that seemingly permanently etched on scowl turns into something so blissful it would almost be comical.
They touched and shivered turning more into a mass of heated gasps and tangled limbs, rocking the bed with each movement of body. Each face flushed, John's pale skin nearly tattooed with the bright red blush up to the tips of his ears as Karkat slowly shifted his pants down in a left-right-left-right fashion; claws ghosting over his skin so delicately it would've tickled had he not been so worked up. The tent in his boxers was prominent, this fact not helping the red hue no not one bit in fact his body managed to pull of the almost impossible feat of darkening, intriguing the troll. He inspected the rise, trailing his fingers over it like a child experimenting with textures, his face beaming when he received a good reaction, usually in the form of sucked in breaths or strangled moans. John tried to shift, discreetly reveal how uncomfortable he was with the investigation, but Karkat would have none of that; he simply held the boys hips in place, making a pout that, albeit groaning in complaint, made John still.
Curiosity was a wonderful thing, and it managed to push the troll further, finding new confidence in his actions as he dipped his fingers under the material. John lurched forward, eyes wide, chewing his bottom lip as though the more he worked it the less anxious he would be.
"Y-You too!"
"John, full sentences please I'm not fucking Vriska I can't just delve into your fucking think pan and know exactly what you mean."
Karkat rolled his eyes, a coy grin playing on his lips as he began to relax not much minding the alien bulge, but eager to see how it looked. John gulped audibly, shifting a bit as he reached a shy hand out to tug at the Cancer's pants this eliciting a very exciting moan. The boy made his best pout, eyes sparkling in the dark room catching every ray of light there was only to reflect back in a sea baby blue.
"I won't be the only one stripped down."