It wasn't like they'd have been able to do this in the past, Klaus knew - though there had been a small part of him that had considered something not quite like this back then. The idea of Ben with him while he did everything had been appealing at certain times during his life, though in practice was far less interesting than his mind had made it seem. But this - Ben was real and whole and living and Klaus could touch him and make him feel the same kind of pleasure that Klaus found so easily whenever he put his mind to it.
With Ben asking to be taught, Klaus was only too eager to help him learn, to show him everything he'd missed out on and see what it was that he liked and not just what Klaus pulled him through.
Klaus pushed himself up just long enough to strip out of the shirt he'd worn hanging open over his chest and tugged at Ben's shirt to do the same, urging him up to help him get the fabric off and out of his way so that when he pushed Ben down once more Klaus was able to let his mouth drag over Ben's chest unimpeded.
"You tell me what you like, let me hear you." He encouraged Ben too, Klaus had learned almost immediately that there was very little that he loved more than than Ben telling him about something he liked, or in this case, voicing his pleasure as Klaus worked his way down his chest taking care to tease all the places that he liked best and suspected might just do the same for Ben, until he had reached his pants and began pulling them down over Ben's hips.