Rule 34 Dev - 2013 anthro armpits balls bed biceps big_penis black_fur black_nose brothers brown_hair canine canine_penis collaboration erection father father_and_son fur furry gay green_eyes hair incest knot male muscles nipples no_humans nude parent pecs penis ryusei sheath sibling son tongue wolf wolfblade yamato_iouko yamatoiouko|1595941288