We're trying to not spoiler anything...buuuuut there's no GxB ending. Although none of the princes are exclusively gay.
The story does explain and clear the possible confusion. Unfortunately much isn't online yet. :'<
Thank you for your interest! <3 we hope this answer helped somehow :x
(And though the story doesn't include it, one of us headcanons Sappho (red hair) and Hans (turqoise hair) very much anyway. >u>)