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2022 2d animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller black_censor_bar blue_blush blush bottom_sans censor_bar censored_penis clothed digital_media_(artwork) dominant_pov faceless_male fingers_interlocked glans grabbing_hand grabbing_hands hand_grab hoodie interlocked_fingers intertwined_fingers japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_pov monster monster_boy penetrating_pov penis pov sans sans_(undertale) skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus soul soul_sex submissive sweat text uke_sans undead undertale undertale_(series) unseen_male_face
2022 2d animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller black_censor_bar blue_blush blush bottom_sans censor_bar censored_penis clothed digital_media_(artwork) dominant_pov faceless_male fingers_interlocked glans grabbing_hand grabbing_hands hand_grab hoodie interlocked_fingers intertwined_fingers japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_pov monster monster_boy penetrating_pov penis pov sans sans_(undertale) skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus soul soul_sex submissive sweat text uke_sans undead undertale undertale_(series) unseen_male_face
2022 2d 2d_(artwork) animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blush bottom_sans brother brothers clothed crying digital_media_(artwork) drooling fontcest gloves hand_on_another's_head hand_on_head hooded_jacket hoodie hugging implied_penetration implied_sex incest intraspecies jacket japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male monster monster_boy motion_lines one_eye_closed orange_blush papyrus papyrus_(undertale) papysans partial_male pixiv red_gloves sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text text_bubble top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2022 2d 2d_(artwork) animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blush bottom_sans brother brothers clothed crying digital_media_(artwork) drooling fontcest gloves hand_on_another's_head hand_on_head hooded_jacket hoodie hugging implied_penetration implied_sex incest intraspecies jacket japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male monster monster_boy motion_lines one_eye_closed orange_blush papyrus papyrus_(undertale) papysans partial_male pixiv red_gloves sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text text_bubble top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2020s 2022 2d 2d_(artwork) anal animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller black_censor_bar blue_blush blue_hoodie blue_jacket blush bottom_sans bottomless brother brother_penetrating_brother brothers censor_bar clothed digital_media_(artwork) drooling duo ectopenis ectoplasm fluids fontcest genital_fluids genitals hooded_jacket hoodie incest intraspecies jacket japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male mastery_position monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans penetration pixiv sans sans_(undertale) seme_papyrus sex sibling_incest siblings sitting sitting_on_lap sitting_on_penis sitting_position skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat text text_bubble top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2020s 2022 2d 2d_(artwork) anal animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller black_censor_bar blue_blush blue_hoodie blue_jacket blush bottom_sans bottomless brother brother_penetrating_brother brothers censor_bar clothed digital_media_(artwork) drooling duo ectopenis ectoplasm fluids fontcest genital_fluids genitals hooded_jacket hoodie incest intraspecies jacket japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male mastery_position monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans penetration pixiv sans sans_(undertale) seme_papyrus sex sibling_incest siblings sitting sitting_on_lap sitting_on_penis sitting_position skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat text text_bubble top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2d animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush bottom_sans clothed crying crying_with_eyes_open drooling faceless_male hoodie japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male monster monster_boy penetration sans sans_(undertale) sex simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus speech_bubble submissive sweat tears text tongue uke_sans undead undertale undertale_(series) unseen_male_face white_background yaoi
2d animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush bottom_sans clothed crying crying_with_eyes_open drooling faceless_male hoodie japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male monster monster_boy penetration sans sans_(undertale) sex simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus speech_bubble submissive sweat tears text tongue uke_sans undead undertale undertale_(series) unseen_male_face white_background yaoi
2d animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_on_top bottom_sans clothed crying crying_with_eyes_open drooling faceless_male hoodie japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_pov monster monster_boy one_eye_closed penetrating_pov penetration penetrator_pov pov sans sans_(undertale) sex simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text uke_sans undead undertale undertale_(series) unseen_male_face white_background yaoi
2d animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_on_top bottom_sans clothed crying crying_with_eyes_open drooling faceless_male hoodie japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_pov monster monster_boy one_eye_closed penetrating_pov penetration penetrator_pov pov sans sans_(undertale) sex simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text uke_sans undead undertale undertale_(series) unseen_male_face white_background yaoi
2d animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_on_top bottom_sans clothed drooling faceless_male hoodie japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_pov male_pubic_hair monster monster_boy penetrating_pov penetration penetrator_pov pov pubic_hair sans sans_(undertale) sex simple_background size_difference skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus speech_bubble submissive sweat text uke_sans undead undertale undertale_(series) unseen_male_face white_background yaoi
2d animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_on_top bottom_sans clothed drooling faceless_male hoodie japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_pov male_pubic_hair monster monster_boy penetrating_pov penetration penetrator_pov pov pubic_hair sans sans_(undertale) sex simple_background size_difference skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus speech_bubble submissive sweat text uke_sans undead undertale undertale_(series) unseen_male_face white_background yaoi
2d ahe_gao ahegao animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush bottom_sans clothed crying digital_media_(artwork) drooling ectoplasm faceless_male from_behind_position grabbing_sheets grey_background gripping_sheets hoodie japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_ahegao male_moaning male_only male_penetrating moaning monster monster_boy on_stomach penetration penetration_from_behind sans sans_(undertale) sex_from_behind simple_background skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text tongue tongue_out uke_sans undead undertale undertale_(series) unseen_male_face yaoi
2d ahe_gao ahegao animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush bottom_sans clothed crying digital_media_(artwork) drooling ectoplasm faceless_male from_behind_position grabbing_sheets grey_background gripping_sheets hoodie japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_ahegao male_moaning male_only male_penetrating moaning monster monster_boy on_stomach penetration penetration_from_behind sans sans_(undertale) sex_from_behind simple_background skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text tongue tongue_out uke_sans undead undertale undertale_(series) unseen_male_face yaoi
2d animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans clothed crying cum cum_inside digital_media_(artwork) dominant_pov from_behind_position hoodie japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_penetrating male_pov monster monster_boy on_stomach penetrating_pov penetration penetration_from_behind pov sans sans_(undertale) sex sex_from_behind skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text uke_sans undead undertale undertale_(series) unseen_male_face yaoi
2d animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans clothed crying cum cum_inside digital_media_(artwork) dominant_pov from_behind_position hoodie japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_penetrating male_pov monster monster_boy on_stomach penetrating_pov penetration penetration_from_behind pov sans sans_(undertale) sex sex_from_behind skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text uke_sans undead undertale undertale_(series) unseen_male_face yaoi
2d animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans clothed crying cum cum_inside digital_media_(artwork) dominant_pov drooling from_behind_position hoodie japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_penetrating male_pov monster monster_boy on_stomach penetrating_pov penetration penetration_from_behind pov sans sans_(undertale) sex sex_from_behind skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text uke_sans undead undertale undertale_(series) unseen_male_face yaoi
2d animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans clothed crying cum cum_inside digital_media_(artwork) dominant_pov drooling from_behind_position hoodie japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_penetrating male_pov monster monster_boy on_stomach penetrating_pov penetration penetration_from_behind pov sans sans_(undertale) sex sex_from_behind skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text uke_sans undead undertale undertale_(series) unseen_male_face yaoi
2d animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans clothed crying digital_media_(artwork) dominant_pov from_behind_position grabbing_sheets gripping_sheets hoodie japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_penetrating male_pov monster monster_boy on_stomach penetrating_pov penetration penetration_from_behind pov sans sans_(undertale) sex sex_from_behind skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text uke_sans undead undertale undertale_(series) unseen_male_face yaoi
2d animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans clothed crying digital_media_(artwork) dominant_pov from_behind_position grabbing_sheets gripping_sheets hoodie japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_penetrating male_pov monster monster_boy on_stomach penetrating_pov penetration penetration_from_behind pov sans sans_(undertale) sex sex_from_behind skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text uke_sans undead undertale undertale_(series) unseen_male_face yaoi
2d animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blue_pussy blue_tongue blush bottom_sans bottomless clothed crying digital_media_(artwork) drooling ectoplasm ectopussy faceless_male hooded_jacket hoodie jacket japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_penetrating monster monster_boy on_back partially_clothed partially_nude penetration sans sans_(undertale) sex skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom submissive sweat tears text tongue uke_sans undead undertale undertale_(series) unseen_male_face yaoi
2d animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blue_pussy blue_tongue blush bottom_sans bottomless clothed crying digital_media_(artwork) drooling ectoplasm ectopussy faceless_male hooded_jacket hoodie jacket japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_penetrating monster monster_boy on_back partially_clothed partially_nude penetration sans sans_(undertale) sex skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom submissive sweat tears text tongue uke_sans undead undertale undertale_(series) unseen_male_face yaoi
2d animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blue_pussy blue_tongue blush bottom_sans bottomless clothed crying digital_media_(artwork) drooling ectoplasm ectopussy faceless_male hooded_jacket hoodie jacket larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_only male_penetrating monster monster_boy on_back partially_clothed partially_nude penetration sans sans_(undertale) sex skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom submissive sweat tears tongue uke_sans undead undertale undertale_(series) unseen_male_face yaoi
2d animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blue_pussy blue_tongue blush bottom_sans bottomless clothed crying digital_media_(artwork) drooling ectoplasm ectopussy faceless_male hooded_jacket hoodie jacket larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_only male_penetrating monster monster_boy on_back partially_clothed partially_nude penetration sans sans_(undertale) sex skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom submissive sweat tears tongue uke_sans undead undertale undertale_(series) unseen_male_face yaoi
2022 2d ahe_gao ahegao animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blue_tongue blush bodily_fluids bottom_sans clothed crying digital_media_(artwork) drooling faceless_male from_behind from_behind_position grabbing_sheets gripping_sheets hooded_jacket hoodie jacket japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_ahegao male_only male_penetrating monster monster_boy on_stomach partially_clothed partially_nude penetration penetration_from_behind sans sans_(undertale) sex sex_from_behind size_difference skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text tongue tongue_out uke_sans undead undertale undertale_(series) unseen_male_face yaoi
2022 2d ahe_gao ahegao animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blue_tongue blush bodily_fluids bottom_sans clothed crying digital_media_(artwork) drooling faceless_male from_behind from_behind_position grabbing_sheets gripping_sheets hooded_jacket hoodie jacket japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_ahegao male_only male_penetrating monster monster_boy on_stomach partially_clothed partially_nude penetration penetration_from_behind sans sans_(undertale) sex sex_from_behind size_difference skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text tongue tongue_out uke_sans undead undertale undertale_(series) unseen_male_face yaoi
2d animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blush bottom_sans bottomless clothed crying digital_media_(artwork) dominant_pov ectoplasm faceless_male grabbing_sheets gripping_sheets hooded_jacket hoodie jacket larger_male larger_penetrating larger_penetrating_smaller legs_held_open logo_(pixiv_id_30462562) male male_only male_penetrating male_pov monster monster_boy on_back one_eye_closed partially_clothed partially_nude penetrating_pov penetration penetrator_pov pov sans sans_(undertale) sex skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus spread_legs submissive sweat tears uke_sans undead undertale undertale_(series) unseen_male_face yaoi
2d animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blush bottom_sans bottomless clothed crying digital_media_(artwork) dominant_pov ectoplasm faceless_male grabbing_sheets gripping_sheets hooded_jacket hoodie jacket larger_male larger_penetrating larger_penetrating_smaller legs_held_open logo_(pixiv_id_30462562) male male_only male_penetrating male_pov monster monster_boy on_back one_eye_closed partially_clothed partially_nude penetrating_pov penetration penetrator_pov pov sans sans_(undertale) sex skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus spread_legs submissive sweat tears uke_sans undead undertale undertale_(series) unseen_male_face yaoi
2020s 2022 2d 2d_(artwork) animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blue_pussy blush bottom_sans carrying clothed cum cum_in_eye cuntboy digital_media_(artwork) ectoplasm ectopussy eye_fucking eye_penetration hooded_jacket hoodie jacket larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_only monster monster_boy partially_clothed partially_nude penetration penis penis_in_eye sans sans_(undertale) sex simple_background skeleton skull_fucking small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus spitroast submissive uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games white_background yaoi
2020s 2022 2d 2d_(artwork) animated_skeleton anon anonymous_male bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blue_pussy blush bottom_sans carrying clothed cum cum_in_eye cuntboy digital_media_(artwork) ectoplasm ectopussy eye_fucking eye_penetration hooded_jacket hoodie jacket larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_only monster monster_boy partially_clothed partially_nude penetration penis penis_in_eye sans sans_(undertale) sex simple_background skeleton skull_fucking small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus spitroast submissive uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games white_background yaoi
1:1 1:1_aspect_ratio 2boys anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller bottom_sans bottomless brother/brother brothers couch couch_sex crying crying_with_eyes_open doggy_position duo fontcest from_behind from_behind_position gay grabbing_hand hoodie incest intraspecies kneel larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating malicious-muffin_(artist) malicious_muffin_(artist) monster monster_boy on_couch on_sofa papyrus papyrus_(undertale) papysans penetration penetration_from_behind sans sans_(undertale) seme_papyrus sex sex_from_behind sex_on_couch sex_on_sofa sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sofa tears thrusting tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) yaoi
1:1 1:1_aspect_ratio 2boys anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller bottom_sans bottomless brother/brother brothers couch couch_sex crying crying_with_eyes_open doggy_position duo fontcest from_behind from_behind_position gay grabbing_hand hoodie incest intraspecies kneel larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating malicious-muffin_(artist) malicious_muffin_(artist) monster monster_boy on_couch on_sofa papyrus papyrus_(undertale) papysans penetration penetration_from_behind sans sans_(undertale) seme_papyrus sex sex_from_behind sex_on_couch sex_on_sofa sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sofa tears thrusting tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) yaoi
2010s 2016 2boys 2d 2d_(artwork) against_table animated_skeleton aroused bent_over bent_over_table big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_body blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed_sex comic comic_panel crossdressing digital_media_(artwork) dirty_talk drooling duo ectobody english_text fontcest food gay incest intraspecies larger_male larger_penetrating larger_penetrating_smaller maid_outfit maid_uniform male male/male male_only male_penetrating monster monster_boy onomatopoeia orange_blush orange_body pajamas papyrus papyrus_(undertale) papysans penetration penetration_from_behind sans sans_(undertale) seme_papyrus sequence sequential sex sex_from_behind sex_on_table sibling_incest siblings skeleton skirt_lift skirt_up small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble table table_sex tablesex talking talking_to_another talking_to_partner text text_bubble thrusting top_papyrus turned_on uke_sans undead undertale undertale_(series) ut-with-all-the-sexy_(artist) vase yaoi yawn
2010s 2016 2boys 2d 2d_(artwork) against_table animated_skeleton aroused bent_over bent_over_table big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_body blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed_sex comic comic_panel crossdressing digital_media_(artwork) dirty_talk drooling duo ectobody english_text fontcest food gay incest intraspecies larger_male larger_penetrating larger_penetrating_smaller maid_outfit maid_uniform male male/male male_only male_penetrating monster monster_boy onomatopoeia orange_blush orange_body pajamas papyrus papyrus_(undertale) papysans penetration penetration_from_behind sans sans_(undertale) seme_papyrus sequence sequential sex sex_from_behind sex_on_table sibling_incest siblings skeleton skirt_lift skirt_up small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble table table_sex tablesex talking talking_to_another talking_to_partner text text_bubble thrusting top_papyrus turned_on uke_sans undead undertale undertale_(series) ut-with-all-the-sexy_(artist) vase yaoi yawn
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