1girl, animal_ear_fluff, animal_ears, blush, bra, breasts, brown_hair, cat_ears, cat_girl, long_hair, lying, mochizuki_riku, navel, on_back, open_mouth, original, panties, pink_bra, pink_panties, red_eyes, ribbon, small_breasts, solo, two_side_up, underwear, underwear_only, upper_body