Rule 34 Dev - 10s 1girl animated animated_gif bare_shoulders black_hair black_leotard bouncing_breasts bow bowtie breasts cleavage detached_collar grisaia_(series) grisaia_no_kajitsu head_out_of_frame leotard long_hair official_art sakaki_yumiko sexually_suggestive solo strapless strapless_leotard|8893311570