1boy, 1girl, ahoge, arm_hair, bed, black_hair, black_legwear, brother_and_sister, closed_eyes, cowgirl_position, girl_on_top, hetero, incest, kiss, kneehighs, leg_hair, lying, no_shoes, on_back, on_bed, pillow, pleated_skirt, saliva, sex, siblings, side_ponytail, skirt, straddling