A human winds up in equestria who won't wake up. An ageless oddity but nothing too concerning. Until a accident happens outside the room its being kept in.

A pony loses their sight.

And suddenly its back again. A miracle past all known magic! The only clue is the now eyeless human.

As the pony sleeps they will see what the human saw.
And when they pass the eyes will return to the human.

Many times will this come to pass. Eyes, legs, limbs, organs all exchanged.

Until the current era. Six friends who share a destiny and a connection to the elements of harmony find out there's another connection between them.

Well that's a bit creapy. Tell me more...

I can't feel my legs oh the horror oh wait never mind.

So, basically this human body loans parts to those who need them. And then when they sleep the human body can experience the world? Then when they die the parts are returned? Correct me if I’m wrong. It sounds really interesting!

6504343
Pretty much.
The parts are loaned so the unmoving human can experience the outside world. But when sleeping the feedback is reversed.
So if you gain ears from the human then when you sleep you'll hear what the human heard throughout their life.

6504365
Oooooh. So it does have a downside. Hmmm. Very unique! I’m impressed with this idea.

6504233
Do it, for I wish to see it.

And so a coterie of Blood Brothers was formed.

Yes

Is this a religion?