Xbooru - 1boy 2010s 2017 2d 2d (artwork) animated skeleton arms behind back black pants blue hoodie blue jacket bondage bottom sans bottomwear bound bound ankles bound arms brown background closed eyes clothed clothing digital media (artwork) fully clothed hooded jacket hoodie jacket kneel male male only malesub monster pants restrainted restraints ribon22 rope rope bondage sans sans (undertale) simple background skeleton solid color background solo male submissive submissive male taped mouth tied ankles tied arms tied up topwear uke sans undead undertale undertale (series) video game character video games