The Last Bus Stop in Hell, Now Boarding by Princeliest (18k, mature)

"haha, what would happen if alastor and angel dust swapped bodies?"

trauma, carnage, and self(?)-mutilation, it turns out. at first, the biggest issue is angel dust trying to navigate alastor's physiology and powers, but that's quickly overshadowed by alastor trying (and horribly failing) to navigate valentino. if you enjoy guilt, panic, and characters bonding over those, this might just be the fic for you.