just don't make one. you can research it just don't brew a canister.
Viewing post in OutGrow - a Giantess and expansion game comments
That doesn't seem to be possible? I tried Research > brew nothing > completely empty out the shelf (like the branch where Chad regrows), but your partner still secretly brews a suppressant anyways and you have to use it. And if I don't research then the scene never triggers, unlike Dom route where I could skip the research?
Oddly, I ended up getting the ending through the scene viewer after getting the above again, which DID acknowledge I had no suppressants in inventory.