The Devil Will Never Cry

So in this story, Keith is Lucifer, and Lance is an angel. Joining Keith in the demon world is Pidge, Matt, and Shiro. Joining Lance in the angel world is Hunk, Allura, and Shay.
Once someone meets their soulmate, and they look into each others eyes, a scar bearing their soulmates name is burned into their back.
One day, Keith and Pidge were out and about in the mortal world, and they both see their soulmates.
And, as every good story goes, they are forbidden to love them.
And, again, as every good story goes, they do it anyway.