FURVERT!

2014 abs animal_genitalia animal_penis anus backsack balls big_butt big_penis butt butt_expansion clothing comic duo english_text equid equine equine_genitalia equine_penis erection expansion fasttrack37d fur fur_growth genital_expansion genitals growth hi_res horse huge_penis human male mammal mid_transformation on_ground penis penis_expansion sound_effects tail tail_growth tail_growth_in_pants text torn_clothing transformation