itou ryuusei, sanbi, aragaki ayase, ore no imouto ga konna ni kawaii wake ga nai, 1girl, bare legs, bare shoulders, between legs, black eyes, black hair, blush, bracelet, breasts, collarbone, dot nose, feet out of frame, female focus, flying sweatdrops, hand between own legs, hand up, jewelry, long hair, looking at viewer, nervous, one-piece swimsuit, open mouth, purple scrunchie, school swimsuit, scrunchie, shiny skin, sitting, small breasts, solo, sweatdrop, swimsuit, wavy mouth, wrist scrunchie, wristband