Even though he's put Derek's hand there, even though it's everything Barry's wanting and more, he sees stars when Derek's fingers find his nipple and tweak, the world tilting in a way that doesn't make sense until Barry realizes Derek's got him on his back.

He gapes up at him, ready for anything until Derek undoes his drawstring with his teeth, and then Barry can only whine. "God, please," he says, hips bucking up against Derek's chin. "I love your mouth."