1girl, all_fours, ass, ass_focus, bad_twitter_id, bent_over, black_shirt, blue_archive, blue_buruma, blue_hair, buruma, from_behind, half-closed_eyes, long_hair, looking_at_viewer, looking_back, mochitsuki_karen, official_alternate_costume, shirt, solo, sticker_on_face, thighs, yuuka_(blue_archive), yuuka_(track)_(blue_archive)