You have to interact with its head. ( To make her swallow a shrinking potion. The statue at the entrance to the room dispenses potions.)
Yay! I knew it was something with the potions but I was just using them wrong. I also was trying to defeat him with a vore arrow.
Is such an awesome detail you pit there, but my brain was weak to do it on my own😝. Again, thanks a lot, big fan of your work