I got stuck on the Zombie Attraction challenge because I hadn't realized it was time for me to rescue the petrified girl yet and thus hadn't obtained the item she gives you, but when I got to the zombies, I put the cowprint half-bra on it and the item description already said that it dispensed holy milk, so I assumed I was just missing a way to actually make it squirt milk. You probably should change the item description so that it checks whether the ring has been used on it, rather than whether it's just in your inventory at all (at least, I assume that's why this happened)
You're welcome! Happy to help. And glad to hear that I know a thing or two about coding, too, lol.
Also, upon having to replay this day multiple times since, I noticed that the slime girl's head, shoulders, and boobs get displaced relative to her torso varying amounts depending on when you press the "continue" button in her bouncing animation cycle. Might have something to do with pressing the continue button too fast, but I think it happened on my first time where I was reading all the text, too.