Hikari (ヒカリ), from the eromanga Mou, kimi de ikitakunai (もう、君でイキたくない), by Tearontaron. Trained on her adult appearance, from 21 images for 840 steps, with some NSFW images included so usually precautions apply. The only thing it doesn't replicate is her hourglass earring.

Sample Prompts:

hikaritaron,black hair,amber eyes,long hair