1girl, o, apple_(ygbhjdbiulsg), ass, ass_focus, bed_sheet, bikini, bikini_tug, black_hair, blush, breasts, covered_nipples, idolmaster, idolmaster_shiny_colors, knees_up, large_breasts, looking_at_viewer, lying, nervous_smile, nose_blush, on_back, ponytail, red_bikini, shirase_sakuya, smile, solo, sweatdrop, swimsuit, thick_thighs, thighs, underboob