Rule 34 Dev - anal anal_penetration anal_sex beastiality blue_fur brown_hair closed_eyes disney dr_heinz_doofenshmirtz gay hat human interspecies knees_on_chest lying_on_back male male_only mammal monotreme multiple_males perry_the_platypus phineas_and_ferb platypus sex size_difference small_dom_big_sub tripperfunster yaoi zoophilia|575517824