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grabbing_chin grey_background hand_under_chin hands_behind_back male male/male male_focus male_only maledom malesub monster one_eye_closed partially_colored penis precum profanity sans sans_(undertale) sanster seme_gaster simple_background skeleton soul soul_sex submissive submissive_male swearing tentacle tentacle_on_male tentacles tentacles_around_legs tentacles_on_male text top_gaster uke_sans undead undertale undertale_(series) video_games yaoi 2010s 2017 2d 2d_(artwork) 4boys animated_skeleton blue_blush blue_tongue blush bottom_sans clothed clothing cum cum_in_mouth cum_on_tongue ectotongue fangs finger_in_mouth fontcest gaster gaster_(undertale) grillby grillby_(undertale) grillsans hand implied_incest lowest-of-dirt lowest_of_dirt male male/male male_only monster multiple_boys one_eye_closed orange_cum orange_penis papyrus papyrus_(undertale) papysans penis red_background sans sans_(undertale) sanster seme_gaster seme_grillby seme_papyrus skeleton solo_focus tongue top_gaster 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multiple_hands pleasure_face pov sans sans_(undertale) sanster seme_gaster skeleton solo_focus text tongue tongue_out top_gaster uke_sans undead undertale undertale_(series) video_games yaoi 1boy 1cuntboy 2010s 2017 2d 2d_(artwork) anal anal_fisting animated_skeleton anus black_and_white bottom_sans clitoris comic comic_page comic_panel cuntboy double_penetration drooling ectopussy fisting fisting_pussy gaster gaster_(undertale) grabbing_mouth male male/cuntboy monochrome monster mouth_held_open multiple_hands nczhhdyb pussy sans sans_(undertale) sanster seme_gaster sequence sequential skeleton solo_focus tears tongue tongue_out top_gaster uke_sans uncensored undead undertale undertale_(series) vaginal vaginal_fisting video_games yaoi 1boy 1cuntboy 2010s 2017 2d 2d_(artwork) ??? animated_skeleton anus black_and_white bottom_sans clitoris comic comic_page cuntboy ectopussy fingers_in_pussy gaster gaster_(undertale) male male/cuntboy monochrome monster multiple_hands nczhhdyb pants_pulled_down pants_pulling pussy pussy_juice sans sans_(undertale) sanster seme_gaster sequence sequential skeleton solo_focus spoken_heart spoken_question_mark spread_anus spread_pussy top_gaster uke_sans uncensored undead undertale undertale_(series) urethra video_games wet_pussy yaoi 1:1 1:1_aspect_ratio 2d 2d_(artwork) animated_skeleton blue_blush blue_tongue bottom_sans daron9 gaster gaster_(undertale) implied_penetration implied_sex korean_text male monster sans sans_(undertale) sanster seme_gaster skeleton solo_focus text tongue tongue_out top_gaster uke_sans undead undertale undertale_(series) unseen_male_face video_games 2015 2d 2d_(artwork) animated_skeleton black_background blue_blush blush bottom_sans clothed duo gaster gaster_(undertale) groping hand hand_on_crotch hands male monster multiple_hands sans sans_(undertale) sanster seme_gaster shirt_up skeleton solo_focus suckmytrombone sweater top_gaster uke_sans undead undertale undertale_(series) video_games 2020s 2022 2d 2d_(artwork) animated_skeleton arm_grab black_and_white bottom_sans clothed covering_mouth fingering fingering_another fingering_partner gaster gaster_(undertale) grabbing_arm grabbing_hand hand hand_grab hand_on_mouth hands male monochrome monster multiple_hands non-con non-consensual noncon nonconsensual pants_pull pants_pulled_down sans sans_(undertale) sanster seme_gaster shirt_lift shirt_pull shirt_up skeleton socks_on top_gaster toubigaizi uke_sans undead undertale undertale_(series) undressing unseen_character video_games 2d 2d_(artwork) animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue bottom_sans english_text from_behind gaster gaster_(undertale) heart-shaped_pupils heart_eyes humanoid humanoid_penetrating larger_male larger_penetrating larger_penetrating_smaller male male_penetrating monochrome nude one_eye_closed penetration sans sans_(undertale) sanster seme_gaster sex sex_from_behind 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clothed disembodied_hands dominant_pov drooling ectoplasm fingering fingering_another fingering_partner gaster gaster_(undertale) hooded_jacket hoodie jacket japanese_text leg_grab legs_apart logo_(pixiv30462562) male monster partially_clothed partially_nude pixiv_id_30462562 potion pov restrained restraints sans sans_(undertale) sanster seme_gaster skeleton solo_focus submissive sweat text top_gaster uke_sans undead undertale undertale_(series) unseen_male unseen_male_face video_games yaoi 2020s 2022 2d 2d_(artwork) animated_skeleton blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_sans clothed crying duo gaster gaster_(undertale) hooded_jacket hoodie jacket japanese_text logo_(pixiv30462562) male male_penetrating monster penetration pixiv_id_30462562 sans sans_(undertale) sanster seme_gaster sex skeleton sweat tears text tongue top_gaster uke_sans undead undertale undertale_(series) video_games yaoi 2017 2d 2d_(artwork) animated_skeleton blue_blush blue_tongue blush 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small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom text third-party_source top_gaster twitter_username uke_sans undead undertale undertale_(series) video_games white_background yaoi 2010s 2018 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bodily_fluids bottom_sans clothed clothed/nude completely_naked completely_nude crying duo fingering fingering_another fingering_partner fluids fully_clothed gaster gaster_(undertale) male monochrome monster naked nude pf-pro-fucker pf_pro_fucker sans sans_(undertale) sanster seme_gaster skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom tears top_gaster uke_sans undertale undertale_(series) video_games white_background yaoi 2010s 2018 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub blush_lines bottom_sans duo gaster gaster_(undertale) male monochrome monster one_eye_closed pf-pro-fucker pf_pro_fucker sans sans_(undertale) sanster seme_gaster skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom sweat top_gaster uke_sans undertale undertale_(series) video_games yaoi 2010s 2018 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bodily_fluids bottom_sans bottomless duo fingering fingering_another fingering_partner fluids gaster gaster_(undertale) lab_coat labcoat male monochrome monster pf-pro-fucker pf_pro_fucker sans sans_(undertale) sanster seme_gaster skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom top_gaster uke_sans undertale undertale_(series) video_games 2010s 2018 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans clothed/nude duo ectoplasm fingering gaster gaster_(undertale) male monochrome monster pf-pro-fucker pf_pro_fucker sans sans_(undertale) sanster seme_gaster skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom top_gaster uke_sans undertale undertale_(series) video_games 1boy 1girl alternate_universe artist_name cowgirl_position female frisky_69 gaster gaster_(undertale) glitchtale hetero jessica_grey male male/female penetration penis red_penis seme_gaster sex straight top_gaster undertale undertale_au vaginal vaginal_penetration white_body 1boy 1girl ahegao alternate_universe anal anal_penetration anal_sex bad_art bad_quality carrying duo female female_focus full_nelson full_nelson_anal gaster gaster_(undertale) glitchtale jessica_grey male male/female poor_quality poorly_drawn seme_gaster solo_focus straight tagme tongue tongue_out top_gaster undertale undertale_au undertale_fanfiction unseen_male_face