Quick additional suggestion to the wing slot area I suggested previously:
Tentacle wings
Total of six tentacles (three each side) with a membrane connecting them.
Maybe could be colored to look like parts are shiny (lighter color patches ?) as a way to show the wings are a bit slimy / glistening.
Again, no mechanical advantage - a purely visual option.
In a related note - and not intentionally spamming you - how about a tentacle penis option ?
Below 50% arousal has the appearance of an average pussy.
At 50% or above has the appearance of a loose pussy with a tentacle coming out of it (that hangs down between the characters legs if visible) of the same length and width of the large human penis.
Functions the same as a normal penis but with alternate art.
