Rule 34 Dev - anthro anus balls bent_over big_butt biped brown_body brown_fur butt erection foreskin fur genitals grey_background humanoid_genitalia humanoid_penis kneeling male musclegut muscular muscular_anthro muscular_male nude overweight overweight_anthro overweight_male partially_retracted_foreskin penis pose presenting presenting_hindquarters pubes rear_view simple_background solo standing thick_thighs cathricorn bear brown_bear grizzly_bear mammal ursine 2017 alternate_version_at_source signature|5965936760