Xbooru - 1boy alternate version available animated skeleton arms behind back artist name ball gag bdsm blue blush blue body blue penis blue tongue blush bondage bottom sans bound arms bound wrists collar collar and leash drooling ectobody ectopenis english text hands behind back kneel leash leash and collar leash pull male male only malesub mouth gag nude penis pet play petplay restrained rope rope bondage sans sans (undertale) skeleton snazz-shack solo solo male submissive male sweat text tongue tongue out trembling uke sans undead undertale undertale (series) unseen character white background