2girls, black_dress, black_gloves, breasts, cake, chair, character_name, dress, feet_out_of_frame, food, fork, gloves, green_hair, hair_between_eyes, happy_birthday, holding, holding_fork, holding_plate, honkai_(series), honkai_impact_3rd, indoors, klein_(honkai_impact), lab_coat, long_hair, long_sleeves, mobius_(honkai_impact), monitor, multiple_girls, office_chair, on_chair, open_clothes, plate, red_eyes, sasame_yuuki, sitting, small_breasts, swivel_chair, twitter_username, very_long_hair