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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
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
blush drooling kustard leg_hump male_only sans sans_au sanscest selfcest singingsans_(artist) underfell underfell_sans undertale undertale_au undertale_sans
blush drooling kustard leg_hump male_only sans sans_au sanscest selfcest singingsans_(artist) underfell underfell_sans undertale undertale_au undertale_sans
blush frisk_au gradient_background kustard orange_background sans sans_au sanscest underfell underfell_frisk underfell_sans undertale undertale_au undertale_sans
blush frisk_au gradient_background kustard orange_background sans sans_au sanscest underfell underfell_frisk underfell_sans undertale undertale_au undertale_sans
2boys big_dom_small_sub bigger_dom blue_blush blue_penis 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 orange_blush pants_only papyrus penis penis_grab sans 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_penis 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 orange_blush pants_only papyrus penis penis_grab sans shirtless sitting smaller_sub smaller_submissive tears topless traditional_art traditional_media traditional_media_(artwork) undertail undertale undertale_sans yaoi
1girls 2021 2boys ambiguous_penetration arm_grab artist_name ass_grab bandana black_sclera blue_bandana blue_blush blue_body blue_scarf blush blushing ectobody elysiansins gloves heart male red_body sans sans_(underfell) sans_(underswap) sanscest scar scarf scars selfcest simple_background skeleton solid_color_background spitroast squeezing_butt thrusting underfell underfell_sans underswap underswap_sans undertale undertale_au undertale_fanfiction undertale_sans watermark yaoi
1girls 2021 2boys ambiguous_penetration arm_grab artist_name ass_grab bandana black_sclera blue_bandana blue_blush blue_body blue_scarf blush blushing ectobody elysiansins gloves heart male red_body sans sans_(underfell) sans_(underswap) sanscest scar scarf scars selfcest simple_background skeleton solid_color_background spitroast squeezing_butt thrusting underfell underfell_sans underswap underswap_sans undertale undertale_au undertale_fanfiction undertale_sans watermark yaoi
1boy animated_skeleton blue_blush blush blushing bottomless disembodied_hand disembodied_hands egg_vibrator floating_hands gay heart laying_on_bed lying_on_bed male male_focus no_genitals non-human sans sex_toy shirt_lift shirt_up skeleton solo_focus undertail undertale undertale_(series) undertale_sans vibrator
1boy animated_skeleton blue_blush blush blushing bottomless disembodied_hand disembodied_hands egg_vibrator floating_hands gay heart laying_on_bed lying_on_bed male male_focus no_genitals non-human sans sex_toy shirt_lift shirt_up skeleton solo_focus undertail undertale undertale_(series) undertale_sans vibrator
blush kustard leg_hump male_only sans sans_au sanscest singingsans_(artist) underfell underfell_sans undertale undertale_au undertale_sans
blush kustard leg_hump male_only sans sans_au sanscest singingsans_(artist) underfell underfell_sans undertale undertale_au undertale_sans
blowjob blush ectobody ectopenis eye_contact fellatio handjob handjob_while_sucking kustard male_only midday_sinner_(artist) pov red_penis sans sans_au sanscest selfcest sucking_tip underfell underfell_sans undertale undertale_au undertale_sans white_background
blowjob blush ectobody ectopenis eye_contact fellatio handjob handjob_while_sucking kustard male_only midday_sinner_(artist) pov red_penis sans sans_au sanscest selfcest sucking_tip underfell underfell_sans undertale undertale_au undertale_sans white_background
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
bound_wrists kustard male_only sans sans_au sanscest singingsans_(artist) soul_sex underfell underfell_sans undertale undertale_au undertale_sans
bound_wrists kustard male_only sans sans_au sanscest singingsans_(artist) soul_sex underfell underfell_sans undertale undertale_au undertale_sans
blush kustard male_only sans sans_au sanscest selfcest singingsans_(artist) soul soul_licking soul_sex underfell underfell_sans undertale undertale_au undertale_sans
blush kustard male_only sans sans_au sanscest selfcest singingsans_(artist) soul soul_licking soul_sex underfell underfell_sans undertale undertale_au undertale_sans
1boy 2021 ahe_gao animated_skeleton blue_belly blue_blush blue_body blue_hoodie blue_jacket blue_penis blue_testicles blue_tongue blush blushing chubby chubby_male clothed crying cum cum_on_face cumming ectobody ectopenis gripping_sheets hole_in_pants hooded_jacket hoodie jacket male male_only monster on_bed one_eye_closed penis sans shirt shorts skeleton solo solo_male sweating tears testicles tongue_out trembling undead undertail undertale undertale_(series) undertale_sans veiny_penis
1boy 2021 ahe_gao animated_skeleton blue_belly blue_blush blue_body blue_hoodie blue_jacket blue_penis blue_testicles blue_tongue blush blushing chubby chubby_male clothed crying cum cum_on_face cumming ectobody ectopenis gripping_sheets hole_in_pants hooded_jacket hoodie jacket male male_only monster on_bed one_eye_closed penis sans shirt shorts skeleton solo solo_male sweating tears testicles tongue_out trembling undead undertail undertale undertale_(series) undertale_sans veiny_penis
!! animated_skeleton blue_blush blue_tongue blush blushing bottomless cropped crying drooling ectopenis ectoplasm english_text erect_penis exclamation_mark exclamation_point fangs immolationyyx incest male male_only male_out_of_frame male_penetrating monster non-con non-consensual noncon nonconsensual orange_penis out_of_frame papyrus papyrus_(undertale) penetration penis pleading sans sans_(undertale) sex shirt_only shirt_up skeleton sweat tears text text_bubble tongue trembling undead undertail undertale undertale_(series) undertale_sans unseen_male unseen_male_face veiny_penis white_background
!! animated_skeleton blue_blush blue_tongue blush blushing bottomless cropped crying drooling ectopenis ectoplasm english_text erect_penis exclamation_mark exclamation_point fangs immolationyyx incest male male_only male_out_of_frame male_penetrating monster non-con non-consensual noncon nonconsensual orange_penis out_of_frame papyrus papyrus_(undertale) penetration penis pleading sans sans_(undertale) sex shirt_only shirt_up skeleton sweat tears text text_bubble tongue trembling undead undertail undertale undertale_(series) undertale_sans unseen_male unseen_male_face veiny_penis white_background
blowjob deep_throat drooling fellatio male_only oral oral_sex sans sanscest under_the_table underfell underfell_sans undertale undertale_sans winking
blowjob deep_throat drooling fellatio male_only oral oral_sex sans sanscest under_the_table underfell underfell_sans undertale undertale_sans winking
ass_expansion big_breasts big_thighs blue_blush blue_hoodie blush blushing breast_expansion breasts chubby_female erect_penis eyelashes faceless_male female female_sans feminization gender_transformation genderbend genderswap genderswap_(mtf) imminent_sex male male_to_female mtf_transformation penis precum purple_background rule_63 sans skeleton speech_bubble thick_thighs thigh_expansion thighs transformation trashtoonz undertale undertale_sans unknown_male unseen_male_face white_body
ass_expansion big_breasts big_thighs blue_blush blue_hoodie blush blushing breast_expansion breasts chubby_female erect_penis eyelashes faceless_male female female_sans feminization gender_transformation genderbend genderswap genderswap_(mtf) imminent_sex male male_to_female mtf_transformation penis precum purple_background rule_63 sans skeleton speech_bubble thick_thighs thigh_expansion thighs transformation trashtoonz undertale undertale_sans unknown_male unseen_male_face white_body
fingering macro/micro male_only micro_on_macro rubbing sans sanscest selfcest shocked_expression text underfell underfell_sans undertale undertale_sans
fingering macro/micro male_only micro_on_macro rubbing sans sanscest selfcest shocked_expression text underfell underfell_sans undertale undertale_sans
2010s 2018 animated_skeleton blue_blush blush blushing fallen9choirs gay looking_at_viewer male red_penis saliva saliva_trail sans simple_background skeleton tagme undertail undertale undertale_(series) undertale_sans white_background
2010s 2018 animated_skeleton blue_blush blush blushing fallen9choirs gay looking_at_viewer male red_penis saliva saliva_trail sans simple_background skeleton tagme undertail undertale undertale_(series) undertale_sans white_background