foone🏳️‍⚧️さんのイラストまとめ

And the picture, uploaded to Danbooboo 14 years ago, is I think one of the initiating images.
This is what set my friend off on their Quest.

(Amusingly, this image was uploaded by another friend of mine from the same IRC channel)

One solution is apparently "put them on upside down"

and another catgirl having to adapt human-style headphones to work on cat ears

And it's unisex too.
There are catboys wearing headphones, too!

(and by catboys I mean Kagamine Len. They're all Kagamine Len)

And here's an example of one that's clearly been designed for catgirls.
It's a sort of headband with pop-up speakers

And here's a catgirl trying and failing to use human-style headphones on cat ears

Ahh, yes, earbuds.

in your human ears.
The ones you have in addition to the cat ears.

There's a lot of them where she's wearing the headphones around her neck, possibly because the artist started to draw it and went WAIT A MINUTE

This one has the headphones sorta coming off, so you can see human ears underneath, which just raises more questions