1boy, 1girl, d, >_<, aged_down, ahoge, black_hair, blush, brother_and_sister, closed_eyes, collarbone, completely_nude, drying, drying_hair, grey_hair, hair_between_eyes, hatafuta, indoors, looking_at_another, motion_lines, multicolored_hair, naked_towel, navel, nude, onii-chan_wa_oshimai!, open_mouth, out-of-frame_censoring, oyama_mahiro, oyama_mahiro_(male), oyama_mihari, purple_hair, short_hair, siblings, smile, split_mouth, towel, two-tone_hair, water_drop, wet, wet_hair, xd, |_|