Okay so I must admit that I'm quite skeptical of a lot of official wedding art because it seems like it's likely just "Look at your waifus in these cute wedding dresses" fanservice, but there is legitimately no heterosexual explanation for this.
Hmmm now I'm imagining Werewolf Suletta, which actually fits in perfectly in the setting somehow. Shy in the sun, a crazy feral beast in the moon/Aerial