Visibility issues with inflated proportions was part of the fun! It gives fun consequence to the transformations and reason not to go as big as you can get away with at the time.
One option in the long term is to give folks a way to mitigate the problem with effort. Lips and boobs already follow and respond to the mouse, so leaning into that by having to turn to the side a bit or try to hold a boob out of the way to see things makes the effects more interactive and keeps them relevant without just blinding players altogether.
As a fun bonus, you still have to use the mouse to interact, so you sort of have to remember where to click on the thing you want as it gets obscured again. That risk of miss-clicking can be a feature and a component of future traps or events that may include hot spots or things to spot that larger players would have greater risk of running afoul of.
I realize that will take some more work to implement and the mouse-over solution is a good bandaid until then but consider reverting that or making it an accessibility setting as the game develops.