FURVERT!

2_anuses all_fours animal_genitalia animal_penis anthro anus balls big_breasts big_butt big_penis black_anus bonifasko breasts butt canine_genitalia canine_penis detailed_background duo erection felid feline genitals glistening glistening_body hand_on_butt herm herm_anthro injection intersex intersex_anthro kangaroo knot kyra_(greyshores)larger_herm larger_intersex looking_back macro macropod male male_anthro mammal marsupial multi_anus nipples penis presenting presenting_hindquarters puffy_anus size_difference smaller_male smile solo_focus tail text vulva what_has_science_done