Rule 34 Dev - 10s 2girls ball_gag bdsm black_hair blue_eyes blue_hair blush bondage bound bound_together crossover from_side gag gagged hai_to_gensou_no_grimgar hibike!_euphonium highres kousaka_reina linked_gag lock merry_(grimgar) multiple_girls padlock portrait purple_eyes saliva shier's_web simple_background tagme white_background|7934113746