rule 34 animal genitalia anthro ball size difference balls belly bernese mountain blue blue eyes borr kantara brown body brown fur canid canine canis digitigrade domestic door doorway full length portrait fully sheathed fur genitals greeting hi res kovinafterdark larger male light ceiling male mammal molosser mountain musclegut muscular muscular male nude overweight overweight male portrait science fiction sheath size difference solo solo focus standing swiss mountain text thick thighs 8964566