The Big ImageBoard (TBIB) - 2015 age difference anal anal penetration anthro anthro on anthro anthro penetrated anthro penetrating anthro penetrating anthro arm support asgore dreemurr asriel dreemurr beard boss monster (undertale) bovid caprine custapple digital media (artwork) duo elemental creature eyes closed facial hair fangs father (lore) father and child (lore) father and son (lore) goat horn incest (lore) larger male larger penetrated long ears lying male male/male male penetrated male penetrating male penetrating male mammal mineral fauna monochrome muscular nude older male older penetrated on back parent (lore) parent and child (lore) parent and son (lore) penetration penile penile penetration platform sex reclined table lotus reclining royalty sex simple background size difference sketch small dom big sub smaller male son (lore) son dom father sub son penetrating father standing standing sex teeth undertale undertale (series) white background younger male