zashiki usagi, zasikiusa, kagamine len, kagamine rin, project diva, project diva (series), vocaloid, translated, 1boy, 1girl, bikini, bikini top lift, blonde hair, blue eyes, blush, bottomless, breasts, brother and sister, clothes lift, girl on top, hair ribbon, hetero, incest, looking at another, looking at viewer, motion lines, nipples, polka dot, polka dot bikini, polka dot swimsuit, profile, ribbon, ribs, saliva, saliva trail, sex, short hair, siblings, sitting, small breasts, speed lines, straddling, sweat, swimsuit, tears, trembling, twincest, twins, upright straddle, vaginal