rule 34 3 169 abstract background accessory alicorn animal genitalia animal penis ass assisted exposure balls black body black fur blue body blue fur blush brother brothers butt crossgender curved horn cutie mark darkened genitalia dialogue dock duo embarrassed equid equine equine penis erection ethereal hair exclamation point feral fetlocks floppy ears folded wings friendship is magic fur genitals girly gradient background hair hair accessory hasbro heart hi res hooves horn jewelry long hair looking back magic male malemale mammal moon multicolored hair my little pony open mouth penis perineum pink penis pony presenting princess celestia mlp princess luna mlp raised leg raised tail rear view rule 63 sibling signature simple background size difference snowberry sparkles speech bubble spread legs spreading sun teasing teeth telekinesis tongue underhoof white body widescreen winged unicorn wings yaoi 6666506