Heaven and Hell are very real and forever growing as more recently passed humans find themselves in one place or another.
While everyone knows who rules Heaven and Hell, they can’t be everywhere at once so just like in medieval Europe both Heaven and Hell are divided up among multiple different angels and demons’ lords and ladies who rule the land and the human souls who now call the place home for all time.
Since Heaven and Hell are forever growing, there is a constant need for more Lords and Ladies to rule, so there is a constant need for more angels and demons to rule over the souls of the humans.
The problem is that the native angels and demons cannot reproduce fast enough to keep up with the number of human souls coming in and the new lands needed to be settled and ruled over.
So it was decided to increase the numbers of demons and angles by turning humans into them.
The problem is that humans once their souls have left their bodies cannot be changed.
So it was decided that single angels and demons would journey to Earth in search of a wife or husband. Once they found one, they would return to heaven and hell and transform their spouse into either an Angle or a Demon and they would rule beside them for all time.
While on Earth, Angels and Demons would pass as humans and live a normal life while they search for love be it straight or gay if they find a partner. If an older demon or angel go down and find a partner with kids, then the kids depending on age may be transformed as well.
That was the plan, but plans do not always go according to plan.
Some Angles and Demons did spend their time really looking for love, dating humans and forming a true connection before taking them to their new lives in Heaven or Hell.
While others, both Angles and Demons alike just wanted to get back to Heaven or Hell and kidnapped a human who caught their eye.
Angels can be just as cruel and mean as what humans would believe demons would be and some Demons can be just as kind and caring as what humans believe Angels would be.
There are dozens of Angles and Demons on Earth at any one time searching for love.