Rule 34 Dev - 2017 animal_genitalia animal_penis brother brother_and_sister cutie_mark duo electric_spark equine equine_penis eto_ya eyewear fan_character feral fur glowing goggles hair hi_res horn horsecock incest long_hair magic male mammal my_little_pony open_mouth oral penis sex sex_toy sibling sister sweet_voltage tongue tongue_out unicorn|2531896120