2013 anal anal_sex anthro anthrofied anus ass blush breasts clitoris closed_eyes cutie_mark devanstar dragon duo equine female friendship_is_magic furry horn inverted_nipples male mammal mrwes my_little_pony nipples nude penetration penis purple_hair pussy rarity_(mlp) scalie sex signature size_difference smooth_skin solo_focus spike_(mlp) straight unicorn white_body