The fact that he was jumped by Sirius was not a surprise, that happened about any time he walked into a room, even when there were other people there thinking of it still could make Remus blush. Also the kiss and how great it was, not a surprise. His lover was a great kisser. But the invite, that was a surprise.
He read the parchment more then once, 1964? They were about four back then. Time-travel was not the problem that jumped out at the wolf though. "How does anybody know you are here?" He could not keep the worry out of his voice, did anybody talk? Did they have a spy in the Order? "Siri, this can be a trap."
He looked up at Sirius and saw the excitement, Remus knew his mate wanted to go. HIS mate, the one he would not ever loose again. "This sounds fun but I think it is too dangerous." He was going to put his foot down, he was not going to let Siri's silver tongue and pleading pout get to him... no, he was not!