Remus was glad that something like this was sufficiently distracting for Sirius. It wasn't working for him, but he wasn't letting Sirius know as much. Nothing could ever distract him enough that he wouldn't remember that Sirius was going to die - and soon. But it felt so good, being close to Sirius like this, feeling his fingers on his skin, that Remus wouldn't mind if they never stopped.
"That's not a problem," he replied with a smile as he trailed his lips along Sirius's jaw and onto his neck. "Not a problem at all. But I'm new to snogging in libraries. You'll have to let me know when we should move on to another activity."