Rule 34 Dev - 1boy 2016 2girls abs anthro anthrofied areola armpits blue_feathers blue_skin blush breasts closed_eyes cutie_mark equine feathers feet friendship_is_magic furry group hair horn humanoid_feet king_sombra_(mlp) lying male male/female mammal multicolored_hair my_little_pony nipples nude on_back on_top open_mouth penetration pia-sama princess_celestia_(mlp) princess_luna_(mlp) reverse_cowgirl_position sex sibling sisters straddling threesome unicorn white_feathers white_skin winged_unicorn wings|654457