Hello! This was the winner of my bounty request

This is an anime-style Pony XL LoRA that can consistently result in a "treasure trail" but for characters with female genitalia... not males.

Sagittal hair line:

a narrow vertical band of hair extending from the pubic hair towards the navel, often slang called a 'Treasure Trail' or 'Happy Trail' (see images for examples)

Thanks to @DarkModeOP for the winning entry <3