Rule 34 Dev - 2016 animal_genitalia animal_penis anus ass balls christmas christmas_tree cutie_mark english_text equine equine_penis erection feathers feral friendship_is_magic fur gift green_eyes hair holidays horn horsecock letter looking_at_viewer loose_feather lying magic male mammal monanniverse multicolored_hair my_little_pony on_back open_mouth penis quill shining_armor_(mlp) solo text tongue tongue_out tree unicorn white_fur|2483504104