Board Thread:Wiki Discussion/@comment-31960778-20170721040405/@comment-32182236-20180116225749

Yeah, Sans didn't write any. His only connection to Alphys is through Gaster. That's actually why Alphys seemed to stutter when asked how she knew Sans.. She herself may not have known how this happened, for that was retconned from the timeline. Sans, of course, shrugged it off, because "hey, doesn't everybody?"