1girl, alternate_costume, animal_ears, arm_behind_back, arm_strap, armpit_crease, ass, blunt_bangs, blunt_ends, blush, bra, breasts, cat_ears, cat_tail, cowboy_shot, frilled_bra, frilled_panties, frills, from_behind, gokou_ruri, hand_up, heart, hime_cut, long_hair, looking_at_viewer, looking_back, mole, mole_under_eye, ore_no_imouto_ga_konna_ni_kawaii_wake_ga_nai, panties, pink_background, purple_bra, purple_eyes, purple_hair, purple_panties, shiny_skin, small_breasts, solo, tail, tanaka_yutaka, underwear, valentine