Xbooru - 2010s 2015 2boys 2d 2d (artwork) animated skeleton artist signature black background blue blush blue eye blue jacket blue penis blush bodily fluids bottom sans bound clothed clothing dark background digital media (artwork) drooling duo ectopenis elatedsceptre flowans flower flowey the flower flowsans glowing glowing penis hooded jacket interspecies jacket long tongue looking down male male/male male only monster penis plant red eyes sans sans (undertale) seme flowey sex simple background skeleton tentacle tentacle on male tentacles on male thorns tongue out top flowey uke sans undead undertale undertale (series) video game character video games vines vines tentacles yaoi