yuki (viper), viper (series), viper v10, animated, animated gif, 1girl, bare shoulders, bed, bed sheet, blue hair, blush, breasts, closed eyes, female focus, female masturbation, fingering, flat chest, grabbing another's breast, grabbing own breast, groping, lying, masturbation, navel, nipples, off shoulder, on back, open clothes, open shirt, pajamas, panties, purple hair, shirt, short hair, sleeves pushed up, small breasts, solo, star (symbol), underwear, white panties