This is Wakaba Mina (若葉美奈), the heroine of the manga "ごめんね美奈ちゃん" by ま☆くわ.

Pony ver. of https://civarchive.com/models/383676/wakaba-mina-v1?modelVersionId=428219

The SD1.5 version seems to have a better understanding of the original style, but I think Pony's response to the prompts is better. This is a much better way to generate NSFW images.

Prompt:

score_9, score_8_up, score_7_up, BREAK source_anime, masterpiece, best quality, (anime screencap:0.7), 
<lora:Wakaba_Mina_Pony_v1:0.7> mina, 1girl, (black hair, brown hair:1.1), short hair, blue eyes, (medium breasts:1.2), happy, 

(navy buruma, gym uniform:1.3), (from behind:1.3), looking at viewer, dutch angle, classroom, (evening, sunset, western sunlight:1.2)

from behind, solo focus, looking at viewer, dutch angle

Negative Prompt:

score_4, score_5, score_6, source_furry, source_pony, source_cartoon, negativeXL_D, unaestheticXL2v10, 
lowres, low quality, normal quality, worst quality, bad anatomy, bad hands, extra digit, extra legs, fewer digits, missing fingers, signature, text, artist name, username, watermark, (1boy, boys:1.5), gym