We'll Meet in My Beautiful Dreams...

Helios is not outright stated as ChibiUsa's "Prince" per say, but the manga implies that it is so. And so as Pegasus hides within ChibiUsa's beautiful dreams, Helios falls in love with her. Truly a mystical way to come together, right?

Their romance was developed about medium- far less that Usagi and Mamoru, Helios and ChibiUsa have only one arc of the manga together and one season of the Anime, but developed far more than many other relationships in the series- such as Rei and Yuuchirou or Makoto and Asanuma. Despite lacking longevity, Takeuchi put serious thought into Small Lady's romantic development with Helios. She, the destined Princess who will inherit the New Silver Millenium; He the sworn Priest and protector of that sacred land Elysion...