rule 34 alicorn animal genitalia anthro balls bench biting lip blue body blue eyes blue fur blue hair briefs brothers brown hair chest tuft clothing colored duo ears up equine erection exhibitionism eye contact facial hair friendship is magic fur fuze gender transformation green eyes hair hi res horn cock inside locker locker room lockers long hair male mammal masturbation my little pony nervous nude open mouth penis princess celestia mlp princess luna mlp rule 63 short hair sibling simple background sitting spread legs spreading stubble teeth tongue tuft underwear white body white fur white hair wing boner wings 1571310