FURVERT!

1:1 4_toes animal_genitalia animal_penis anthro anus balls biceps big_penis biped brown_body brown_fur butt canid canine canine_genitalia canine_penis canis claws digitigrade domestic_dog erection eyes_closed fangs feet fur genitals hindpaw knot knotted_penis lying male mammal masturbation muscular muscular_anthro muscular_male nude on_back paws pecs penile penile_masturbation penis pose sheath sitting solo spread_legs spreading tail tail_anus teeth toe_claws toes tsaiwolf