Kurt's eyes closed at the feeling of Blaine's fingernails in his hair, his own digging in slightly against his hips before his hands slid back to cup his ass. His fingers pressed in against the soft flesh and muscle, and he leaned in to press a soft kiss against the puckered skin before letting his tongue make long, wet strokes over it.
If there was anything he could do to make Blaine feel good, feel better, in the face of everything that had happened -- the end of the world and all -- he would. It didn't hurt that giving Blaine pleasure was something that he enjoyed, so really everyone won.