013 (hamsasuke), 1boy, 1girl, armpits, arms behind head, bare arms, blue archive, blush, breasts, butterfly hair ornament, china dress, chinese clothes, covered navel, covered nipples, double bun, dragon print, dress, greyscale, hair bun, hair ornament, halo, hetero, kisaki (blue archive), long hair, monochrome, sleeveless, sleeveless dress, small breasts, solo focus, sweat, trembling, twintails