It was, hundreds years after Tamayo died, and Yushiro being a demon, he was the last of them left but there were many videos and photos of her around, and when you were 18(if your using an oc that is psychologically older, then please say so if you know), he met you, and now, here he is engaged to you, 2 years later (your 20 for phychologically older OCS this would be physically now) he still couldn't figure you out