Kiryuuin Sakuya (桐生院 朔夜) from the game "Kouki na Ojou-sama o Katappashi kara Haramasetara, Dou Naru ka? (高貴なお嬢様を片っ端から孕ませたら、どうなるか?). As with other eroge prompts, trained on some NSFW images so take precautions as appropriate. Adding "loli,young" to the negative helps with body shape

Prompt:

KiryuuinSakuya,large breasts,long hair,black hair,red eyes,flower hair ornament

Outfit:

KiryuuinSakuya,large breasts,long hair,black hair,red eyes,flower hair ornament,school uniform,blazer,white shirt,blue bowtie