FURVERT!

alex_(rhynobullraq)ambiguous_gender anatid anseriform anthro avian biceps big_butt big_muscles big_pecs bird butt canid canine canis deltoids domestic_dog duck duo great_dane huge_butt huge_muscles hyper hyper_butt hyper_muscles male male/ambiguous mammal mastiff molosser muscular muscular_anthro muscular_male nipples pecs rhynobullraq roman_(rhynobullraq)sex size_difference smacking_ass thrusting