Awhile ago, I did a small comic on paper about my original character, Octavia, whom is a cow, going through puberty.
I always draw her horns small, so I thought, "what if when she went through puberty, her horns grew to gigantic size?"
After drawing the comic, I imagined her in her grown form. Usually, when a girl is part cow or whatever in hentai/ecchi stuff, they have huge tits. I decided to draw Tavi this way to see how it looked. Surprisingly, I really like the result, and am even considering doing a hentai comic about it when I get the chance.
Tavi shown here would be about 25 years old. In the original comic, she's still at least 18.