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anal anal_penetration anthro balls bodily_fluids cum cum_in_ass cum_inside duo erection eulipotyphlan genital_fluids genitals hedgehog humanoid_genitalia humanoid_penis male male/male male_penetrated male_penetrating male_penetrating_male mammal masturbation monochrome one_eye_closed penetration penile penile_masturbation penis sega sex solo_focus sonic_the_hedgehog sonic_the_hedgehog_(series)spread_legs spreading unknown_artist