（best qualtiy，8K，tmasterpiece：1.2），（realisticlying，realisticlying），twincest，Two 18-year-old girls wearing thin thread thong on the bed,kneeling on a bed，The girl's feet parted，The soles of the feet are facing back，Hands on the bed，cocking the buttocks，There are pink patting marks on the buttocks，Fully open back, Unobstructed，Open and unobstructed，lit from behind, Sexy body, Sexy girl, Watching from behind, Smooth translucent white skin, Sexy hot body,chest baring，Medium chest，White shiny chest，Chest up，Pink areola，posterior view, posing in bed, Beautiful girls, on the bed, Shiny white skin, long shot from back, Sexy pose，Fair and translucent skin

(nsfw:1.5),verybadimagenegative_v1.3, ng_deepnegative_v1_75t, (ugly face:0.8),cross-eyed,sketches, (worst quality:2), (low quality:2), (normal quality:2), lowres, normal quality, ((monochrome)), ((grayscale)), skin spots, acnes, skin blemishes, bad anatomy, DeepNegative, facing away, tilted head, {Multiple people}, lowres, bad anatomy, bad hands, text, error, missing fingers, extra digit, fewer digits, cropped, worstquality, low quality, normal quality, jpegartifacts, signature, watermark, username, blurry, bad feet, cropped, poorly drawn hands, poorly drawn face, mutation, deformed, worst quality, low quality, normal quality, jpeg artifacts, signature, watermark, extra fingers, fewer digits, extra limbs, extra arms,extra legs, malformed limbs, fused fingers, too many fingers, long neck, cross-eyed,mutated hands, polar lowres, bad body, bad proportions, gross proportions, text, error, missing fingers, missing arms, missing legs, extra digit, extra arms, extra leg, extra foot, ((repeating hair))