Im not sure if it was intentional but the futa sister's tip kinda looks like a big meaty acorn when its flared up like that.
Also really love the size differences between the two. The short jigglier fatter squirrel with a huge fat tail, bigger udders, belly, and rump. And the tighter sister with a smaller sister with tighter, firmer looking features with a fluffy tail. This is peak design.