(Disclaimer: I don't own Fullmetal Alchemist. I thought about writing this from Greed's perspective, but this story is already so weird. That wouldn't have helped.)
Envy was walking down the tunnel underground, where all the homunculi lived. They'd just turned a corner when they saw Greed heading towards the bathroom. There was only one down there, homunculi didn't need to use one very often. Gluttony didn't need to use one at all. Envy had found out why first hand a few hours ago. It had not been a trip they wanted to have.
Then again, Greed was in the body of a human now. Maybe he'd have to go to the bathroom more often. Well, if Greed's life was going to be more inconvenient, Envy had no complaints. With a shrug, they started walking down the tunnel again. They were just outside the bathroom door when Greed started shouting, seemingly to no one.
"Hey kid! What the hell did you eat?!"
Envy jumped and turned towards the door.
"Kid, prince, whatever. That still doesn't answer the question." Another pause. "Why would you eat a boot?!"
Well, that would explain why Edward had only had one boot in the portal. This was entertaining, but also kind of weird. It was probably time to go. At the very least, Envy wanted to be out of there before someone else came by and asked what was going on.