The really funny thing about "snakes aren't mammals your snake girl shouldn't have breasts!" is like yeah. Neither should your cat girl.
The fact that this is the line drawn is really funny! Human breasts are actually incredibly rare among mammals! We don't know exactly why humans have big bazongas but it's probably sexual selection, which presents the really funny problem
If your snake women having sex with people is normal and expected...then yeah, they're ALSO probably going to have something resembling breasts. They might even just have breasts in all but function.
Like yes, non-mammals don't make milk, but you actually don't need the whole kit that humans do in order to make milk. Arguably its not even the important part of the breast to begin with.
You also don't need to justify it at all you can just be a pervert about it.
We actually have another theory why human breasts are like that, and it's because of our flat faces.
Most mammals have, compared to humans, an elongated jaw. So a little tiny bump of a mammary gland is fine, just enough to get the nostrils away from the teat, and the young can freely breathe while nursing. However, as humans started using fire more and more to cook food - which softened it up, rendering powerful jaws less necessary - their jaws began to shorten, resulting in the development of the chin and other unique facial structures as the face flattened out.
This, of course, meant that babies could suffocate while nursing, which would obviously be bad. But what if... what if nipple further from chest? Bigger bump, so baby's nose have spot to go that isn't directly into mommy's chest? Oh, turns out that works! Of course, as more and more fat stores become dedicated to growing that breast mound to keep baby from suffocating, it becomes harder and harder for the mother to reabsorb that tissue when not nursing (as many other mammals do), so they just... don't. Knockon effects from there, and bam. Tiddies.
Which means if your cat girl has a flat face she probably should still have boobs but if she's got the full muzzle, not so much.
That's actually really interesting honestly.














