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1boy 2020s 2023 alternate_version_available animated_skeleton balls blue_penis blue_testicles blush bondage bottom_sans bound bound_arms bound_legs ectopenis grey_background legs_apart male male_only mellouwana monster nude penis precum sacrum_lacing sans sans_(undertale) simple_background skeleton solid_color_background solo solo_male string submissive submissive_male sweat testicle uke_sans undead undertale undertale_(series)
1boy 2020s 2023 alternate_version_available animated_skeleton balls blue_penis blue_testicles blush bondage bottom_sans bound bound_arms bound_legs ectopenis grey_background legs_apart male male_only mellouwana monster nude penis precum sacrum_lacing sans sans_(undertale) simple_background skeleton solid_color_background solo solo_male string submissive submissive_male sweat testicle uke_sans undead undertale undertale_(series)
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1:1 1:1_aspect_ratio 1boy 2d 2d_(artwork) animated_skeleton balls blue_blush blue_hoodie blue_jacket blue_penis blue_testicles blush bottomless bottomless_male clothed comic_sans digital_media_(artwork) ectopenis ectoplasm english_text fallen_ghost_angel_(artist) genitals glowing glowing_genitalia glowing_penis grabbing_own_penis hi_res high_res high_resolution hires hooded_jacket hoodie jacket looking_at_genitalia looking_at_own_penis looking_at_penis looking_down lying_on_back male male_masturbation male_only masturbation monster monster_boy on_back penile_masturbation penis pillow precum sans sans_(undertale) skeleton socks solo_male speech_bubble sweat talking_to_self testicles text twitter undead undertale undertale_(series) video_game_character video_games
1boy 2010s 2015 2d 2d_(artwork) animated_skeleton artist_name bad_id bad_tumblr_id balls blue_background blue_blush blue_eye blue_penis blue_testicles blue_tongue blush bottom_sans bound_arms bound_wrists chain chain_leash chains collar cowboy_shot digital_media_(artwork) drooling ectopenis ectotongue glowing_eye inactive_account male male_only malesub monster naked noxiousaberration nude penis sans sans_(undertale) simple_background skeleton solo solo_male submissive submissive_male sweat testicles tied_up tied_wrists tongue tongue_out tumblr uke_sans undead undertale undertale_(series) video_game_character video_games
1boy 2010s 2015 2d 2d_(artwork) animated_skeleton artist_name bad_id bad_tumblr_id balls blue_background blue_blush blue_eye blue_penis blue_testicles blue_tongue blush bottom_sans bound_arms bound_wrists chain chain_leash chains collar cowboy_shot digital_media_(artwork) drooling ectopenis ectotongue glowing_eye inactive_account male male_only malesub monster naked noxiousaberration nude penis sans sans_(undertale) simple_background skeleton solo solo_male submissive submissive_male sweat testicles tied_up tied_wrists tongue tongue_out tumblr uke_sans undead undertale undertale_(series) video_game_character video_games
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1boy 1girl 2022 3d 3d_animation animated anthro anthro_on_anthro armlet big_breasts big_nipples big_penis big_testicles blue_body blue_eyes blue_fur blue_penis blue_testicles bouncing_testicles bracelet breasts duo echidna erection eulipotyphlan fellatio footwear fur furry genitals gif gloves green_eyes handwear hedgehog interspecies jewelry kneel loop low-angle_view male mammal monotreme nipples nude open_mouth oral orange_body orange_fur penis red_clothing red_footwear red_nipples red_shoes sega sex shoes short_playtime smile sonic_adventure sonic_the_hedgehog sonic_the_hedgehog_(series) source_filmmaker standing straight tan_body tan_fur testicle tikal_the_echidna vein veiny_penis wector white_clothing white_footwear white_gloves white_handwear white_shoes
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