2016 anal anal_sex animal_genitalia animal_penis arith_(arith_the_gryphon) arith_the_gryphon ass_up avian bar beak detailed_background duo erection exhibitionism feathered_wings feathers feral feral_on_feral from_behind_position girly green_eyes gryphon hawkthorn knot male mounting open_mouth penetration penis precum pub sex talons tapering_penis wing-of-chaos wings yaoi