gelbooruhttps://xbooru.com/index.php?page=atom&tags=2010s 2018 2d 2d (artwork) animated skeleton big dom big dom small sub bigger dom bigger dom smaller sub bodily fluids bottom sans bottomless duo fingering fingering another fingering partner fluids gaster gaster (undertale) lab coat labcoat male monochrome monster pf-pro-fucker pf pro fucker sans sans (undertale) sanster seme gaster skeleton small sub small sub big dom smaller sub smaller sub bigger dom top gaster uke sans undertale undertale (series) video games2024-05-17T19:41:06Zgelbooru