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2021 2d_animation animated animated_gif anthro anus arms_above_head barazoku beard big_butt big_muscles bodily_fluids border bowser butt collar cum duo erection eyebrows facial_hair frame_by_frame genital_fluids genitals hair horn human human_on_anthro humanoid_genitalia humanoid_penis imminent_sex interspecies koopa larger_sub loop luigi male male/male male_on_anthro male_on_human mammal mario_bros motion_tweening musclegut muscular muscular_anthro muscular_human muscular_male muscular_on_muscular mustache nintendo nude penis perineum pink_background raised_arm rear_view scalie shell short_playtime simple_background size_difference small_top_big_bottom spiked_collar spiked_shell spikes spikes_(anatomy)submissive swirlzeez tail tail_motion tailwag warm_colors white_border