Well, it's a hypernetwork. 🫠 I guess you could say it works pretty much like a LoRA. Sort of like an "old school" LoRA. 😅 At least in practice. (Back a few years ago when I was using local AI, SD 1.5 in Automatic1111. I often even prefered using hypernetworks. Most of the time, a surprisingly low weight (of say, 0.2 to 0.5 or so.) was all it took to create the desired effect.)
Anyway... This is obviously used for generating images with enormous breasts. It should work with SD 1.5, and at weight 1 have an, eh... Enormous effect.（ ͜.人 ͜.）
No trigger words needed! The weight recommended is just a suggested starting point. Try different settings, you'll figure it out.
I got it from someone on huggingface.co