Board Thread:Questions and Answers/@comment-90.221.228.185-20150511233505/@comment-27384850-20161024141201

Everyone here is going back and forth about 16.5, but even without that it's still canon that they did things. Kawahara has already stated that Sugary Days is canon, and there's no "what if" in those stories. Just based on those confirmed-canon stories, there is no doubt that Kirito and Asuna did it.