FURVERT!

4:3 animal_genitalia animal_penis animated animated_gif anthro ball_growth balls bear belly belly_expansion biceps big_balls big_breasts big_butt big_muscles big_pecs big_penis breast_shrinking breasts butt claws erection expansion female flexing ftm_transformation gender_transformation genital_growth genitals growth hair huge_muscles huge_penis human long_penis long_playtime male mammal muscle_growth musclegut muscular muscular_anthro muscular_male nipples nude pec_expansion pecs pecs_growth penis penis_growth rtf-m sheath sheath_growth solo species_transformation tapering_penis throbbing throbbing_penis transformation vein veiny_muscles vulva