The Big ImageBoard (TBIB) - 2003 all fours anal anal penetration anthro anthro on anthro anthro penetrated anthro penetrating anthro penetrating anthro balls barely visible balls barely visible genitalia big dom small sub biped butt butt grab canid canine canis canon couple circles (comic) condom condom wrapper doggystyle domestic dog dominant douglas pope duo erection eyes closed floppy ears from behind position genitals glans grabbing sheets greyscale hand on butt humanoid genitalia humanoid penis k-9 looking pleasured lube lube bottle lutrine male male/male male penetrated male penetrating male penetrating male mammal monochrome mustelid nipples nude obscured penetration paul mayhew penetration penile penile penetration penis penis in ass platform standing doggystyle raised tail sex sexual barrier device side butt side view size difference sketch smaller penetrated thick tail traditional media (artwork)