[quote=@Ariamis]
Does a magical girl count as a monster girl for anti-monster girl Patrons if they proc Monstrous Metamorphosis? On that note, if a Beacon-aligned girl allies with Lily and Lily transforms, do they get excommunicated?
[/quote]

No, they wouldn't be excommunicated just for a metamorphosis. Beacon girls can actually use that perk too. Some of the more zealous ones might be prejudiced towards someone they know has it, but they won't see you as a monster.