Yeah that's also something I found questionable myself after reading the new chapters...
Since Eros and Anteros were kind of mirrors to each other in mythology even in real traditional ancient Greek vase paintings they are both depicted with standard bird-like or feathered wings.
Psyche is the one famously and consistently depicted with butterfly wings in ancient art and mythology. Because her name psyche literally means translates to“soul” and “butterfly” hence why she was the goddess of souls and had butterfly shaped wings...
Maybe the author wanted to create a further contrast between Eros and Anteros by giving them different type of wings?
But I am also curious to how this will affect Psyche's wings...
Also after searching I found that there have been a few recent depictions of Anteros with butterfly wings from artists like Alfred Gilbert’s famous 1893 statue of Anteros on the Shaftesbury Memorial Fountain in Piccadilly Circus.
But I would have preferred the went along with the og...
They actually followed the myths description about anteros appearance accurately, based on the writings anteros wings was described that of a plumed butterfly which sets him and psyche apart from other gods who have feathered wings.
Plumed butterfly wings as far as I can tell means butterfly shape but with feathers. But interesting point
I wonder what the author is thinking giving him butterfly wings? In the original story, Psyche gets butterfly wings at the end. It's her thing, why does this lil boy have them? I can onyl find depictions of him with birds wings when I look up the name