Rule 34 Dev - animal_genitalia balls becoming_erect big_balls blush bodily_fluids dsub9 duo english_text erection feral genitals hi_res humping male male/male mammal mouse murid murine penis profanity rat rodent saliva scent scent_play semi-anthro sheath size_difference slightly_chubby sniffing spitting spitting_on_face text|11556286528