Rule 34 Dev - 2024 2boys abs ai_generated animal_genitalia animal_penis anthro anthro_on_anthro avaru balls big_penis bodily_fluids closed_eyes equid equine equine_genitalia equine_penis erection gay genital_fluids genitals horse humanoid kissing male male_only mammal monochrome muscular muscular_male nipples nude penis precum simple_background vein veiny_penis white_background yaoi|11470621384