1girl, armpits, arms_behind_head, arms_up, black_hair, blush, breasts, closed_mouth, crop_top, din_(pixiv25800872), grey_background, knit_sweater, large_breasts, navel, original, panties, parted_bangs, pink_panties, ribbed_sweater, short_hair, signature, sleeveless, stained_clothes, stomach, summer, sweat, sweater, sweaty_clothes, thighs, turtleneck, underwear