1boy, arms_behind_back, bdsm, belt, black_collar, black_gloves, black_pants, bound, bound_wrists, brown_belt, collar, collared_shirt, cowboy_shot, cuffs, fate/grand_order, fate_(series), from_behind, gloves, grey_background, grey_eyes, grey_hair, kainohito, looking_at_viewer, looking_back, male_focus, mask, mouth_mask, o-ring, pants, saitou_hajime_(fate), shirt, short_hair, simple_background, solo, white_shirt