The Flower of (Un)requited Love [EdVy]

Months after the promised day, and months after Envy had managed to wiggle away and survive Mustang's wrath, they've discovered that they now cough up flower petals. Unsure of what this means for them, they consult Ed, who they had been trying to get closer to since the conclusion of the Promised Day, who told them that it must mean their in love.
But Envy? Capable of loving? Surely it wasn't possible. After all, they hated humans, and it was hard for them to feel any other emotion than envy and its variations.
And if they were, would he ever love them back after all they had done?
[One-Sided EdVy, cross-posted from AO3]