FURVERT!

after_transformation all_fours animal_genitalia animal_penis anthro anthro_on_anthro anus ass_up black_body black_fur black_hair black_nose blush border_collie breasts butt canid canine canine_genitalia canine_penis canis collar collar_only collie domestic_dog door duo erection eyes_closed fangs female female_penetrated fur genitals hair happy happy_sex herding_dog indoor_nudity indoor_sex inside kneeling knot laboratory looking_back male male/female male_penetrating male_penetrating_female mammal nipples nude pastoral_dog pawpads paws penetration penile penile_penetration penis penis_in_vagina pink_nipples raised_tail romantic romantic_couple sabretoothed_ermine scientific_experiment sex sheepdog spread_butt spread_legs spread_vulva spreading tail teeth tongue tongue_out transformation transformation_through_sex vaginal vaginal_penetration vulva white_body white_fur