niss oekaki, arona (blue archive), blue archive, highres, 1boy, 1girl, ass, bare back, bare shoulders, bikini, blue hair, blue halo, bow, bow bikini, braid, eyewear on head, facing away, frilled bikini, frills, from behind, grey background, hair ribbon, halo, heart, hetero, holding another's wrist, layered bikini, loli, multicolored hair, penis, pink bow, pink hair, ribbon, sex, sex from behind, simple background, solo focus, sunglasses, sweat, swimsuit, trembling, twin braids, white background, x-ray