His hands end up spread flat on the mattress, twisting into fists whenever the other Kurt does something that feels particularly good--which is often. "I am beginning to disbelieve your claims," he mumbles haltingly, interrupting himself every second word with a gasp, or low strangled noises that sometimes make it out of his mouth as moans. His tail sneaks up his twin's leg, slipping forward and running the tip lightly over the underside of his cock; at least, what little he can reach of it.