User blog comment:Sakuya156/Has anyone?/@comment-4725812-20120102075130/@comment-4725484-20120102164217

"If we don't do things that will hurt each other then we will be unable to move forward."

The thing is, If Yuki is a pureblood and Zero is a level-D vampire, then she will stop againg around her 20s and he will continue to age and eventually die. And somehow, even if they do get together, if one of them dies while the other keeps living forever without them, I don't consider it a happy ending.