that roy and ed have skin to skin contact

A Roy/Ed soulmate AU where making skin to skin contact reveals your soulmate (maybe it’s an appearing mark/tattoo, maybe it’s an instant soulbond, maybe you just know). And the first time Roy and Ed make skin contact

IS WHEN THEY’RE SAYING GOODBYE. BUT THEY STILL HAVE TO GO OFF AND DO WHAT NEEDS TO BE DONE. THEY BOTH PROMISE TO COME BACK BUT ED DOESN’T. AND ROY ALWAYS KNEW ED WAS ALIVE BECAUSE SOULMATES JUST KNOW THESE THINGS.