I came running! This is going to be amazing!

Wow! Really exciting and awesomely made! Still hope you keep the rich Lore with the Underground Organisms, too.

You know: it would be cool, if not just the seminal glands would be increasing but also his balls as sperm-producing glands - and maybe even his cock from all the milking and maybe a certain "growth" agent, that makes muscles and the genital tissue grow (scifi genetics can probably do that ;-) ) with the Seminal Glands and his body also becum more sturdy/muscular, but of course far from the sexy Caprini-Bulls for obvious reasons. But for someone exceptionally receptive to the changes and procedures (if you keep that part of the story from the old one, that is?), I would think he's grow really well at that age still.

Would be hot, but just an idea for more visible growth (maybe even optional if that's possible) - even though the sprites for his cock and physiology look really awesome and he's already pretty hung for a human. But becumming a "Cumstud" for Caprini delights, could also include the increase of physical prowess to endure their railing even longer and milk them even better, I'd imagine.

It's so well-made still, and the right and left-click navigation is also intuitive and easy to understand, despite sometimes a little annoying when you wanna click the text in the center window and you miss it ^_^ - but it's not something that truly disturbs the fun.
Love it and looking forward to the next version, when finally getting into that Bathhouse with one's Augments ready then.