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2d_animation 3:2 animated animated_gif anthro arched_back balls bodily_fluids canid canine canis domestic_dog edging erection frame_by_frame genital_fluids genitals humanoid_genitalia humanoid_penis leaking_precum male mammal masturbation monochrome navel nipples nude penile penile_masturbation penis precum short_playtime simple_background simple_eyes solo submarine_screw white_background