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animated_skeleton blue_blush blush bondage bound_arms bound_legs cockotron completely_naked completely_nude drooling fangs fvdsfs kneel looking_at_viewer malesub monster naked nude rope rope_bondage sans sans_(undertale) skeleton solo submissive tied_arms tied_legs tied_up trembling tumblr_username undead undertale undertale_(series) white_background
animated_skeleton blue_blush blush bondage bound_arms bound_legs cockotron completely_naked completely_nude drooling fangs fvdsfs kneel looking_at_viewer malesub monster naked nude rope rope_bondage sans sans_(undertale) skeleton solo submissive tied_arms tied_legs tied_up trembling tumblr_username undead undertale undertale_(series) white_background
animated_skeleton ass_up blue_blush blush cockotron cussing drooling ectotongue fangs fvdsfs grabbing_sheets gripping_sheets kneeling masturbation moaning monster pillow sans sans_(undertale) sex_toy skeleton solo swearing tongue_out top-down_bottom-up trembling undead undertale undertale_(series) vibrator
animated_skeleton ass_up blue_blush blush cockotron cussing drooling ectotongue fangs fvdsfs grabbing_sheets gripping_sheets kneeling masturbation moaning monster pillow sans sans_(undertale) sex_toy skeleton solo swearing tongue_out top-down_bottom-up trembling undead undertale undertale_(series) vibrator
2016 :3 animated_skeleton blue_glans blush cockotron dark_background duo fire_elemental fvdsfs grillby looking_at_another looking_away male male_focus monster orange_body orange_penis pants_only penis penis_out red_background sans sans_(undertale) simple_background skeleton solid_color_background solo_focus sweat text topless topless_male tumblr_username undead undertale undertale_(series) unzipped unzipped_pants
2016 :3 animated_skeleton blue_glans blush cockotron dark_background duo fire_elemental fvdsfs grillby looking_at_another looking_away male male_focus monster orange_body orange_penis pants_only penis penis_out red_background sans sans_(undertale) simple_background skeleton solid_color_background solo_focus sweat text topless topless_male tumblr_username undead undertale undertale_(series) unzipped unzipped_pants
1:1 1:1_aspect_ratio 2016 animated_skeleton blowjob_pov blue_blush blue_tongue blush cockotron ectotongue faceless_male fellatio fvdsfs gay licking licking_penis long_tongue male male_pov monster oral penis penis_in_mouth pink_sweater pov sans sans_(undertale) simple_background skeleton solo_focus sweat sweater tongue undead undertale undertale_(series) unseen_male_face upper_body white_background
1:1 1:1_aspect_ratio 2016 animated_skeleton blowjob_pov blue_blush blue_tongue blush cockotron ectotongue faceless_male fellatio fvdsfs gay licking licking_penis long_tongue male male_pov monster oral penis penis_in_mouth pink_sweater pov sans sans_(undertale) simple_background skeleton solo_focus sweat sweater tongue undead undertale undertale_(series) unseen_male_face upper_body white_background
2015 animated_skeleton blue_tentacles blue_tongue bottomless clothed cockotron drooling ectotongue fvdsfs jacket jacket_only male male_focus monochrome monster sans sans_(undertale) skeleton solo_focus tentacle tentacles_around_arms tentacles_around_legs tentacles_around_wrists tongue tongue_out tumblr_username undead undertale undertale_(series)
2015 animated_skeleton blue_tentacles blue_tongue bottomless clothed cockotron drooling ectotongue fvdsfs jacket jacket_only male male_focus monochrome monster sans sans_(undertale) skeleton solo_focus tentacle tentacles_around_arms tentacles_around_legs tentacles_around_wrists tongue tongue_out tumblr_username undead undertale undertale_(series)
1boy 2010s 2015 animated_skeleton biting_clothes biting_shirt blue_blush blush bottomless clothing cockotron eye_roll fangs fvdsfs humping male_only masturbation monster pillow pillow_humping pillow_ride pillow_sex sans sans_(undertale) shirt_in_mouth shirt_lift shirt_only shirt_up skeleton solo undead undertale undertale_(series) white_background
1boy 2010s 2015 animated_skeleton biting_clothes biting_shirt blue_blush blush bottomless clothing cockotron eye_roll fangs fvdsfs humping male_only masturbation monster pillow pillow_humping pillow_ride pillow_sex sans sans_(undertale) shirt_in_mouth shirt_lift shirt_only shirt_up skeleton solo undead undertale undertale_(series) white_background