all_fours anal anthro anus backsack balls big_muscles blue_eyes bodily_fluids brown_body brown_fur butt butt_grab claws cum cum_from_ass cum_in_ass cum_inside cum_on_ground detailed_fur duo erection eyebrows frown fur gaping gaping_anus genital_fluids genitals hand_on_butt handpaw leaking_cum licking male muscular oral paws penis rimming sex size_difference thick_arms thick_eyebrows tongue tongue_out white_eyebrows yellow_body yellow_fur zeid_(director) mammal ursid detailed
It's not perfect, but this type of position is quite rare and difficult to achieve, so I'm sharing it anyway.