Xbooru - 2010s 2016 2boys 2d 2d (artwork) animated skeleton ass ass grab blue ass blue blush blue body blue butt bottom sans bottomless bottomless male brother brother and brother brothers butt comic digital media (artwork) dominant pov duo ectobody ectobutt ectopenis english text flower fontcest grabbing ass hands on ass holding flower hotdogging incest looking at viewer looking back looking back at viewer male male only male pov malicious-muffin (artist) malicious muffin (artist) moaning monster orange penis papyrus papyrus (undertale) papysans partially colored penis penis between ass penis on ass pov pov ass sans sans (undertale) seme papyrus skeleton solo focus speech bubble sweater text text bubble top papyrus uke sans undead undertale undertale (series) unseen character unseen male unseen male face video game character video games yaoi