Xbooru - 1boy 2010s 2016 anal animated skeleton bottom sans clothed clothing crying crying with eyes open english text grabbing sheets gripping sheets laying on stomach lying on stomach male only monster pants around legs pants down penetration penetration from behind sans sans (undertale) skeleton solo submissive tears tentacle tentacle on male tentacle penetration tentacle sex text theyaois thrusting uke sans undead undertale undertale (series) white background