project diva, project diva (series), vocaloid
kagamine len, kagamine rin
zashiki usagi
1boy, 1girl, bikini, bikini top lift, blonde hair, blue eyes, blush, bottomless, breasts, brother and sister, clothes lift, girl on top, hetero, incest, medium breasts, nipples, polka dot, polka dot bikini, polka dot swimsuit, saliva, saliva trail, sex, short hair, siblings, straddling, sweat, swimsuit, swimwear (module), twincest, twins, upright straddle
commentary request, translated