I don't think the celebration scenes are meant to be romantic, they're meant to be casual liaison between people physically attracted to each other after a period of heightened emotions (i.e. the climax of the grove/goblin conflict)
I agree with you in so much as the celebration scene feels a little disjointed, mostly because they seem to exist in their own continuity, there is little to reference your characters relationship throughout Act 1 beyond which side you chose.
