1boy 1girl adolescence_(vocaloid) ahoge bare_arms bare_shoulders blazer blonde_hair blue_eyes blush brother_and_sister camisole collarbone collared_shirt flat_chest frilled_camisole frills hand_on_another's_shoulder implied_fingering incest jacket kagamine_len kagamine_rin looking_at_viewer mimi_mine nervous parted_lips shirt short_ponytail siblings sleeveless_blazer smug spaghetti_strap spiked_hair sweatdrop twincest twins vocaloid white_camisole white_shirt yellow_nails yellow_shirt