He just appeared in her childhood, participated in her purest time, gave him a code name, childhood sweetheart, that's all...
Maybe it was a coincidence, maybe it was intentional, but they did come together.
After two years he left and she searched. She found him, but also found an unacceptable truth.
Finally, every day from now on, she will have him protecting her. She looked innocent, and he shook his head and giggled, because they still had a lifetime together.
They promised him not to forget, to smile and move on.