Rule 34 Dev - 1boy 2010s 2018 2d 2d_(artwork) animated_skeleton arms_behind_back blue_blush blue_collar blush bottom_sans bound bound_arms bound_hands collar collar_and_leash completely_naked completely_nude digital_media_(artwork) drooling hands_behind_back humanoid kneel kneeling leash leash_and_collar leash_pull male male_only malesub monster monster_boy nsfwgarbagedump nude nude_male pixiv_id_36285069 restrained restraints sans sans_(undertale) skeleton solo submissive submissive_male sweat uke_sans undead undertale undertale_(series) video_game_character video_games white_background|1017002