Rule 34 Dev - 2_penises animal_genitalia animal_penis animated anthro arthropod becoming_erect bed bedroom bedroom_eyes big_penis breasts changeling diphallia diphallism equid equine equine_genitalia equine_penis female frazy friendship_is_magic fully_sheathed furniture futanari genital_growth genitals getting_erect growth gynomorph hair hasbro hi_res hooves horn horse hybrid_genitalia hybrid_penis intersex knot knotted_equine_penis long_hair long_penis mammal multi_genitalia multi_penis my_little_pony narrowed_eyes on_bed penis penis_growth penis_tip pony presenting presenting_penis red_hair seductive sheath sitting solo solo_focus throbbing throbbing_penis|11709739192