The Big ImageBoard (TBIB) - 2015 age difference anal anal penetration anthro anthro on anthro anthro penetrated anthro penetrating anthro penetrating anthro arm hair asgore dreemurr asriel dreemurr (god form) ass up beard blonde hair blue eyes blush bodily fluids body hair boss monster (undertale) bovid caprine cum cum in ass cum inside custapple duo facial hair fangs father (lore) father and child (lore) father and son (lore) forearm hair forearms from behind position fur genital fluids grey background hair horn incest (lore) larger male larger penetrated long ears male male/male male penetrated male penetrating male penetrating male mammal mature anthro mature male mounting muscular nude older penetrated parent (lore) parent and child (lore) parent and son (lore) penetration penile penile penetration royalty sex simple background size difference sketch slightly chubby small dom big sub smaller male son (lore) son dom father sub son penetrating father star teeth thick thighs undertale undertale (series) white body white fur yellow body yellow fur