FURVERT!

2013 4_toes all_fours anthro anus backsack balls bdsm blush bondage bound butt canid canine digitigrade dominant dominant_male duo equid equine erection feet genitals hooves horse interspecies male male/male mammal monochrome nude penis perineum rajii rope simple_background sitting sketch submissive submissive_male tail teasing toes underhoof unguligrade white_background