Rule 34 Dev - 1girl black_skirt black_tail black_thighhighs black_wings blonde_hair blush book breasts cleavage coat crossed_legs demon_girl demon_horns demon_tail demon_wings high-waist_skirt highres holding holding_pen hololive horns lab_coat large_breasts long_hair menmen_(menmen13s) on_chair pen pink_shirt pointy_ears see-through see-through_thighhighs shirt single_bare_shoulder single_off_shoulder sitting skirt solo sunlight tail thighhighs virtual_youtuber white_coat window wings yuzuki_choco yuzuki_choco_(1st_costume)|23412058020