Listen Fluttershy, I only need to absorb your love through my horn. Lips contact is NOT necessary.
But Discord said......
A changeling with a kind heart is likely to starve because it wouldn't hurt its subject, but what if the subject is "willing" to give their love? Like in some fiction, vampires get their most needed blood through blood donation or blackmarket trading. Maybe changeling could live peacefully with ponies that way. As Chrysalis said, Equestria has more love than anyplace she had ever encountered and Shiny Armor's recovery proves that being absorbed doesn't cause permanent damage to the subject. So if Equestria use their love for a diplomatic truce, maybe the 2 races could establish a more mild and friendly relationship instead of waging war to each other.
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