Admittedly Klaus had very little qualms about personal boundaries, certainly there were none where his family was concerned, but even people he didn't know all that well, so touching and leaning close were all simply things that didn't cross his mind for even a moment that they might be unacceptable. It was just his way. He was just as likely to end up in the lap of a friend as he was to sprawl out on the floor so this was all just natural.
"I'd say you're doing a bit more than trying," Klaus decided a small smirk tugging at the corners of his mouth when Regulus only just missed catching his fingertip between his teeth.
"You just keep taking those steps forward, whether it's telling the entire net about what you do in private or watching movies, or just listening to more of this." He said his fingers wiggling a little with the music that still played as they talked.