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anthro anthro_on_anthro blush bodily_fluids bulge canid canine catsudon comic computer cum cum_in_mouth cum_inside dialogue doctor duo electronics english_text erection eyewear fellatio genital_fluids genitals glasses hi_res humor larger_male male male/male mammal monochrome muscular oral penile penis presenting presenting_penis sex size_difference smaller_male speech_bubble stuttering text tongue tongue_out url vein veiny_penis