FURVERT!

anthro biped black_and_white bng canid canine digital_drawing_(artwork)digital_media_(artwork)duo erection foreskin full-length_portrait genitals hi_res humanoid_genitalia humanoid_penis larger_male line_art lying male male/male male_on_bottom male_on_top mammal monochrome muscular nude on_back on_bottom on_top partially_retracted_foreskin penis portrait retracted_foreskin side_view sitting size_difference smaller_male straddling tail three-quarter_portrait