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It looks like she has a bad case of excessive lordosis but i think it's natural for women to have more lordosis than men. If you've ever seen a pregnant women in the late stage of her pregnancy you see they naturally stick out their arse more as a counterweight for the shifting center of gravity in their swollen belly. Urumi's case looks like that, she just isn't pregnant (yet).
No matter how you look it, the S-shaped curve of her hips and the way her pelvic area slopes down to her vagina in those high-waist jeans is insanely erotic, reminds of Yakubo's body type actually.