Rule 34 Dev - 1boy 2021 2d 2d_(artwork) animated_skeleton arms_behind_back blue_blush blush bottom_sans bound_wrists digital_media_(artwork) gradient_background grey_background humanoid kneel looking_at_viewer male male_only meridasia monster monster_boy nude nude_male sacrum_lacing sans sans_(undertale) simple_background skeleton tied_arms tied_up tied_wrists uke_sans undead undertale undertale_(series) video_game_character video_games|1010262

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