I've chosen Lythe as my prospective husband.
That's her royal prerogative. If she wants to skip to that stage, it's her right. Provided he survives that long.... This Princess skipped a few steps in their relationship.
Maybe she saw his size and thing " damn it's way bigger than dads " or maybe other thingsConsidering her ability, and the likelihood she saw him acquiring more skills from his opponent. I can understand the princess being interested in him enough to make him a royal knight.
…the husband thing is completely different though.