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2boys animated_skeleton blush censor_bar censored crying crying_with_eyes_open cuntboy drool drooling faceless_male gay hands_on_wall intersex japanese_text laying_down laying_on_stomach livestream logo_(pixiv30462562) male penetration penis pixiv_id_30462562 sans sex skeleton soul_sex stuck stuck_in_object stuck_in_wall sweat sweating tears text through_wall trapped undertail undertale undertale_(series) undertale_sans unknown_male unseen_male_face
animated_skeleton blue_blush blush blushing bone bottomless eli-sin-g english_text flower flowey_the_flower gay kolesjoie legs_apart legs_spread male male_only mouth_forced_open plant sans simple_background skeleton spread_legs tentacle tentacle_around_leg tentacle_in_mouth tentacle_under_clothes tentacles tentacles_around_arms tentacles_around_wrists tentacles_in_mouth tentacles_under_clothes text undertail undertale undertale_(series) undertale_sans vine_tentacles vines white_background
animated_skeleton blue_blush blush blushing bone bottomless eli-sin-g english_text flower flowey_the_flower gay kolesjoie legs_apart legs_spread male male_only mouth_forced_open plant sans simple_background skeleton spread_legs tentacle tentacle_around_leg tentacle_in_mouth tentacle_under_clothes tentacles tentacles_around_arms tentacles_around_wrists tentacles_in_mouth tentacles_under_clothes text undertail undertale undertale_(series) undertale_sans vine_tentacles vines white_background
1boy 2017 2d animated_skeleton blue_blush blue_penis blush blushing closed_eyes crying cum ectopenis english_text fully_clothed heki_(artist) humanoid jerking_off jerkingoff male male_only masturbating masturbation precum sans skeleton solo solo_male sweat sweatdrop talking tears text touching_penis touching_self two-handed_masturbation undertail undertale undertale_(series) undertale_sans
1boy 2017 2d animated_skeleton blue_blush blue_penis blush blushing closed_eyes crying cum ectopenis english_text fully_clothed heki_(artist) humanoid jerking_off jerkingoff male male_only masturbating masturbation precum sans skeleton solo solo_male sweat sweatdrop talking tears text touching_penis touching_self two-handed_masturbation undertail undertale undertale_(series) undertale_sans
1boy animated_skeleton blue_blush blue_penis blush blushing bodily_fluids bodily_fluids_on_penis ectopenis hands_over_head laying_down looking_at_own_penis lying_down male male_only nervous penis precum precum_drip precum_on_penis sans shirt_up skeleton solo solo_male sweat tagme undertail undertale undertale_(series) undertale_sans
1boy animated_skeleton blue_blush blue_penis blush blushing bodily_fluids bodily_fluids_on_penis ectopenis hands_over_head laying_down looking_at_own_penis lying_down male male_only nervous penis precum precum_drip precum_on_penis sans shirt_up skeleton solo solo_male sweat tagme undertail undertale undertale_(series) undertale_sans
2boys ahe_gao choking degradation drooling gay penetration sans sanscest sweating tongue_out underfell underfell_sans undertale undertale_sans
2boys ahe_gao choking degradation drooling gay penetration sans sanscest sweating tongue_out underfell underfell_sans undertale undertale_sans
2boys blue_blush blush censor_bar censored crying dominant_pov faceless_male gay holding_down holding_hands japanese_text logo_(pixiv30462562) male male_only one_eye_closed penetrating_pov pixiv_id_30462562 pov sans skeleton smaller_penetrated smaller_sub smaller_submissive soul_sex sweat sweating tears text undertail undertale undertale_(series) undertale_sans unknown_male unseen_male_face
2boys blue_blush blush censor_bar censored crying dominant_pov faceless_male gay holding_down holding_hands japanese_text logo_(pixiv30462562) male male_only one_eye_closed penetrating_pov pixiv_id_30462562 pov sans skeleton smaller_penetrated smaller_sub smaller_submissive soul_sex sweat sweating tears text undertail undertale undertale_(series) undertale_sans unknown_male unseen_male_face
2boys big_dom_small_sub bigger_dom blue_blush blue_dick blue_eyes blue_penis blue_pupils blue_testicles blue_tongue blush bonetrouble brother brother/brother brother_and_brother brothers cropped crying drawn drool drooling erect_penis erection erection_under_clothes gay grabbing_penis handjob incest kneeling male male/male male_only meta_request orange_blush pants_only papyrus penis penis_grab sans sans_blush sans_eye sans_glowing_eye sans_penis shirtless sitting smaller_sub smaller_submissive tears topless traditional_art traditional_media traditional_media_(artwork) undertail undertale undertale_sans yaoi
2boys big_dom_small_sub bigger_dom blue_blush blue_dick blue_eyes blue_penis blue_pupils blue_testicles blue_tongue blush bonetrouble brother brother/brother brother_and_brother brothers cropped crying drawn drool drooling erect_penis erection erection_under_clothes gay grabbing_penis handjob incest kneeling male male/male male_only meta_request orange_blush pants_only papyrus penis penis_grab sans sans_blush sans_eye sans_glowing_eye sans_penis shirtless sitting smaller_sub smaller_submissive tears topless traditional_art traditional_media traditional_media_(artwork) undertail undertale undertale_sans yaoi
2boys blue_blush blush crying drool drooling faceless_male gay grabbing_bedding gripping_sheets holding_hips logo_(pixiv30462562) male male_only on_bed penetration pixiv_id_30462562 sans skeleton sweat sweating tears tears_of_pleasure undertail undertale undertale_(series) undertale_sans unknown_male unseen_male_face
2boys blue_blush blush crying drool drooling faceless_male gay grabbing_bedding gripping_sheets holding_hips logo_(pixiv30462562) male male_only on_bed penetration pixiv_id_30462562 sans skeleton sweat sweating tears tears_of_pleasure undertail undertale undertale_(series) undertale_sans unknown_male unseen_male_face
<3 2boys anal anal_sex ass_up big_dom big_dom_small_sub bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blush blushing closed_eyes crying crying_with_eyes_open cum cum_in_pussy cumming dialogue dominant_pov embarrassed faceless_male fucked_from_behind gay grabbing_bedding grabbing_sheets gripping_sheets holding_hips human_on_humanoid japanese_text larger_penetrating larger_penetrating_smaller logo_(pixiv30462562) looking_back male male_only monster monster_boy on_bed penetrating_pov penetration pixiv_id_30462562 pov sans simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_submissive soul_sex sweat sweating tears undertail undertale undertale_(series) undertale_sans unknown_male unseen_male_face yaoi
<3 2boys anal anal_sex ass_up big_dom big_dom_small_sub bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blush blushing closed_eyes crying crying_with_eyes_open cum cum_in_pussy cumming dialogue dominant_pov embarrassed faceless_male fucked_from_behind gay grabbing_bedding grabbing_sheets gripping_sheets holding_hips human_on_humanoid japanese_text larger_penetrating larger_penetrating_smaller logo_(pixiv30462562) looking_back male male_only monster monster_boy on_bed penetrating_pov penetration pixiv_id_30462562 pov sans simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_submissive soul_sex sweat sweating tears undertail undertale undertale_(series) undertale_sans unknown_male unseen_male_face yaoi
bottomless cunnilingus drool gay korean_text kustard legs_apart legs_spread male peng2_(artist) peng2_undertale_(artist) sans sans_(underfell) sans_au sanscest selfcest soul_sex spread_legs text text_bubble tied_up tongue_out underfell underfell_sans undertale undertale_au undertale_sans
bottomless cunnilingus drool gay korean_text kustard legs_apart legs_spread male peng2_(artist) peng2_undertale_(artist) sans sans_(underfell) sans_au sanscest selfcest soul_sex spread_legs text text_bubble tied_up tongue_out underfell underfell_sans undertale undertale_au undertale_sans
against_door blush brothers comic english_text incest male monster papyrus_au penetration sans sans_au sex sibling skeleton text tongue_out underfell underfell_papyrus underfell_sans undertale undertale_fanfiction undertale_sans unseen_male_face yaoi
against_door blush brothers comic english_text incest male monster papyrus_au penetration sans sans_au sex sibling skeleton text tongue_out underfell underfell_papyrus underfell_sans undertale undertale_fanfiction undertale_sans unseen_male_face yaoi
1girls 2d anon anonymous_character ass ass_grab big_ass big_thighs blue_body blue_pussy blush boobs breasts color dialogue disembodied_hand disembodied_hands ectobody ectobutt ectopussy english english_dialogue english_text eyelashes faceless_character female female_sans genderbend genderbent genderswap genderswap_(mtf) grabbing_ass hands hands_on_ass hellbelief huge_ass jelly looking_back looking_down pussy rule_63 sans showing_pussy simple_background skeleton smug_face solo_female text text_box text_bubble thick thick_ass thick_thighs uncensored undertail undertale undertale_(series) undertale_sans visible_pussy white_background wide_hips
1girls 2d anon anonymous_character ass ass_grab big_ass big_thighs blue_body blue_pussy blush boobs breasts color dialogue disembodied_hand disembodied_hands ectobody ectobutt ectopussy english english_dialogue english_text eyelashes faceless_character female female_sans genderbend genderbent genderswap genderswap_(mtf) grabbing_ass hands hands_on_ass hellbelief huge_ass jelly looking_back looking_down pussy rule_63 sans showing_pussy simple_background skeleton smug_face solo_female text text_box text_bubble thick thick_ass thick_thighs uncensored undertail undertale undertale_(series) undertale_sans visible_pussy white_background wide_hips
1boy anal anal_sex blue_blush blush censor_bar censored chained drool drooling experiment gay group japanese_text laboratory legs_forced_open legs_held_open logo_(pixiv30462562) male male_only mechanical_tentacles penetration pixiv_id_30462562 restrained robotic_arm robotic_tentacles sans skeleton solo_focus soul_sex sweat sweating tentacle text trapped undertail undertale undertale_(series) undertale_sans watching
1boy anal anal_sex blue_blush blush censor_bar censored chained drool drooling experiment gay group japanese_text laboratory legs_forced_open legs_held_open logo_(pixiv30462562) male male_only mechanical_tentacles penetration pixiv_id_30462562 restrained robotic_arm robotic_tentacles sans skeleton solo_focus soul_sex sweat sweating tentacle text trapped undertail undertale undertale_(series) undertale_sans watching