1boy 1futa 2019 absurd_res animal_genitalia animal_penis balls black_balls brother brother_and_sister cheating cucked_by_futa cuckold dialogue duo english_text equid equine_penis feral feral_on_feral feral_on_male feral_only friendship_is_magic from_behind furry futa_on_male futanari gynomorph gynomorph/male hi_res horn horsecock huge_cock incest infidelity inside intersex intersex/male male male_penetrated malesub mammal my_little_pony netorare ntr open_mouth penis pony purple_balls purple_penis sex shining_armor_(mlp) siblings sister spaal spread_legs spreading text tongue tongue_out twilight_sparkle_(mlp) unicorn vein