TL;DR use 0.65 to start and "inverted nipples", inverted_nipples to activate. Increase weight or batch size if desired effect is not achieved.

I'm back! I thought I'd touch up my oldest Lora after learning a few tricks.

This LoRA generates inverted nipples - where the nipple is recessed into the areola. Some are round, some are slanty - we'll get to that.

This LoRA has surprisingly little effect on the visual fidelity of the image, but it's also fragile; some style and character LoRAs are incompatible. Increasing the weight or rerolling the seed can often (but not always) fix this.

I noticed there are quite a few types of inverted nipples while collecting the dataset, with the "slit" pointing every which way. The full LoRA likes to play it safe and generate "volcano"-style nipples in most scenarios. I paired back the dataset to only horizontally-oriented slits for the sideways-only LoRA, which is a little more resilient. I'd use that one, unless you want the volcano-style nipples.

Both new LoRAs are LoCon-Lycoris, so you need the extension.