Rule 34 Dev - 2013 abs anal anal_sex anthro balls bed biceps big_muscles big_penis black_fur black_nose border_collie brother brothers brown_hair canine canine_penis collaboration erection furry gay green_eyes hair incest knot male max_kiana muscles no_humans nude open_mouth pecs penetration penis ryusei sex sheath sibling tongue twincest twins wolfblade yamatoiouko|1566928096