The Big ImageBoard (TBIB) - 2005 3d (artwork) anthro anthro penetrating anthro penetrating human anvil position biped canid canine canis digital media (artwork) duo female female on anthro female penetrated from front position human human on anthro human penetrated interspecies larger anthro larger male legs up male male/female male on human male penetrating male penetrating female mammal penetration sex size difference smaller female smaller human smaller penetrated tail unknown artist wolf