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2010s 2018 2boys 2d 2d_(artwork) after_sex animated_skeleton apologizing bottom_sans brother brother/brother brother_and_brother brothers clothed clothed_male clothing comic comic_page cum cum_on_face digital_media_(artwork) duo echoheartx elegantfolly english_text fontcest fully_clothed fully_clothed_male gay hugged_from_behind hugging_from_behind male male/male male_only monochrome monster papyrus papyrus_(undertale) papysans sans sans_(undertale) seme_papyrus semen_on_face sequence sequential simple_background skeleton solid_color_background text top_papyrus uke_sans undead undertale undertale_(series) upper_body video_game_character video_games yaoi 2010s 2018 2boys 2d 2d_(artwork) animated_skeleton artist_name begging begging_to_cum black_background blue_cum blue_penis blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothed_male clothing comic comic_page comic_panel cum digital_media_(artwork) dominant dominant_male domination drooling duo echoheartx ectopenis ectotongue ejaculation elegantfolly english_text fontcest fully_clothed fully_clothed_male gay gloves handjob hooded_jacket hoodie incest jacket laying_on_back lying_on_back male male/male male_only maledom malesub monochrome monster orange_cum orange_penis orgasm papyrus papyrus_(undertale) papysans partially_colored penis prehensile_penis sans sans_(undertale) seme_papyrus semen_on_face sequence sequential skeleton submissive submissive_male tentacle_penis text tongue top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi 2010s 2018 2boys 2d 2d_(artwork) animated_skeleton artist_name black_background blue_penis blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothed_male clothing comic comic_page comic_panel couch cum cum_on_face digital_media_(artwork) dirty_talk dominant dominant_male domination duo echoheartx ectopenis elegantfolly english_text fontcest fully_clothed fully_clothed_male gay gloves handjob hooded_jacket hoodie incest jacket kicking kicking_another male male/male male_only maledom malesub monochrome monster orange_cum orange_penis papyrus papyrus_(undertale) papysans partially_colored penis prehensile_penis sans sans_(undertale) seme_papyrus semen_on_face sequence sequential skeleton sofa submissive submissive_male tentacle_penis text top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi ... 2010s 2018 2boys 2d 2d_(artwork) animated_skeleton artist_name black_background blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothed_male clothing comic comic_page comic_panel cum cum_on_face cumshot digital_media_(artwork) dirty_talk dominant dominant_male domination dubious_consent duo echoheartx ectopenis ectotongue ejaculation elegantfolly english_text fellatio fontcest fully_clothed fully_clothed_male gay gloves grabbing_head head_grab hooded_jacket hoodie incest jacket licking_penis male male/male male_only maledom malesub monochrome monster oral orange_cum orange_penis orange_tongue orgasm papyrus papyrus_(undertale) papysans partially_colored penis prehensile_penis sans sans_(undertale) seme_papyrus semen_on_face sequence sequential skeleton submissive submissive_male sweat tentacle_penis text tongue top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi 2010s 2018 2boys 2d 2d_(artwork) animated_skeleton artist_name black_background blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothed_male clothing comic comic_page comic_panel digital_media_(artwork) dirty_talk dominant dominant_male domination dubious_consent duo echoheartx ectopenis ectotongue elegantfolly english_text fellatio fontcest fully_clothed fully_clothed_male gay gloves grabbing_head head_grab hooded_jacket hoodie incest jacket licking_penis male male/male male_only maledom malesub monochrome monster oral orange_penis orange_tongue papyrus papyrus_(undertale) papysans partially_colored penis prehensile_penis profanity sans sans_(undertale) seme_papyrus sequence sequential sitting skeleton submissive submissive_male tentacle_penis text tongue top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi 2010s 2018 2boys 2d 2d_(artwork) animated_skeleton artist_name black_background blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothed_male clothing comic comic_page comic_panel digital_media_(artwork) dirty_talk dominant dominant_male domination dubious_consent duo echoheartx ectopenis ectotongue elegantfolly english_text fellatio fontcest fully_clothed fully_clothed_male gay gloves grabbing_head head_grab hooded_jacket hoodie incest jacket licking_penis male male/male male_only maledom malesub monochrome monster oral orange_penis orange_tongue papyrus papyrus_(undertale) papysans partially_colored penis prehensile_penis profanity sans sans_(undertale) seme_papyrus sequence sequential sitting skeleton submissive submissive_male tentacle_penis text tongue top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi 2010s 2018 2boys 2d 2d_(artwork) animated_skeleton artist_name black_background blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothed_male clothing comic comic_page comic_panel couch digital_media_(artwork) dominant dominant_male domination duo echoheartx ectopenis elegantfolly english_text fontcest fully_clothed fully_clothed_male gloves grabbing_head head_grab hooded_jacket hoodie imminent_fellatio imminent_incest imminent_oral incest jacket male male/male male_only maledom malesub monochrome monster orange_penis papyrus papyrus_(undertale) papysans partially_colored penis penis_on_face prehensile_penis sans sans_(undertale) seme_papyrus sequence sequential sitting sitting_on_couch sitting_on_sofa skeleton sofa submissive submissive_male tentacle_penis text top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi 2010s 2018 2boys 2d 2d_(artwork) animated_skeleton artist_name black_background blush bottom_sans brother brother/brother brother_and_brother brothers clothed clothed_male clothing comic comic_page comic_panel couch digital_media_(artwork) dominant dominant_male domination duo echoheartx ectopenis elegantfolly english_text fontcest fully_clothed fully_clothed_male gloves grabbing_head head_grab hooded_jacket hoodie imminent_fellatio imminent_incest imminent_oral incest jacket male male/male male_only maledom malesub monochrome monster orange_penis papyrus papyrus_(undertale) papysans partially_colored penis prehensile_penis sans sans_(undertale) seme_papyrus sequence sequential sitting sitting_on_couch sitting_on_sofa skeleton sofa submissive submissive_male tentacle_penis text top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi 2010s 2018 2boys 2d 2d_(artwork) animated_skeleton artist_name blue_blush blush bottom_sans clothed digital_media_(artwork) duo echoheartx elegantfolly fire fire_elemental grillby grillby_(undertale) grillsans imminent_sex kneel male male/male male_only partially_clothed sans sans_(undertale) skeleton topless topless_male uke_sans undead undertale undertale_(series) undertale_fanfiction video_game_character video_games yaoi 1_girl 1boy 1boy1girl 1girl 2d 2d_(artwork) animated_skeleton anthro anthro_focus blue_body blue_breasts blue_eyes blue_pussy blue_skin blue_tongue blush bottom_on_top breast_grab breasts clothed/nude clothed_male clothed_male_nude_female completely_naked_female completely_nude_female digital_media_(artwork) duo echoheartx ectopenis elegantfolly female female_anthro female_focus female_on_top female_penetrated femdom gloves grabbing_breast grabbing_leg hetero indoors interspecies leg_grab male male/female male_penetrating naked_female nipples non-mammal_breasts non-mammal_nipples nude_female nude_female_clothed_male nude_male orange_penis papydyne papyrus papyrus_(undertale) penetration penis penis_in_pussy power_bottom red_areola red_gloves red_hair red_nipples riding_penis seme_papyrus sex sharp_teeth skeleton solo_focus straight straight_sex submissive_top top_papyrus undead undertale undertale_(series) undyne unseen_male_face vaginal vaginal_penetration video_game_character video_games yellow_sclera yellow_teeth 2010s 2018 2_girls 2d 2d_(artwork) 2girls alphyne alphys alphys_(undertale) alternate_version_available anthro anthro_on_anthro anthro_only artist_name bed bedroom black_bra black_panties black_underwear blue_body blue_skin breasts breasts_exposed canon_couple digital_media_(artwork) duo echoheartx elegantfolly exposed_breasts exposed_nipples female female/female female_only fish fish_girl indoors lesbian lizard lizard_girl monster monster_girl naked naked_female nipples non-mammal_breasts non-mammal_nipples nude nude_female on_bed red_hair reptile reptile_girl scalie undertale undertale_(series) underwear underwear_only undyne unphys video_game_character video_games yellow_body yellow_skin yuri 2010s 2018 2_girls 2d 2d_(artwork) 2girls alphyne alphys alphys_(undertale) alternate_version_available anthro anthro_on_anthro anthro_only bed bedroom black_bra black_panties black_underwear blue_body blue_skin breasts canon_couple digital_media_(artwork) duo echoheartx elegantfolly female female/female female_only fish fish_girl grey_panties indoors lesbian lizard lizard_girl monster monster_girl non-mammal_breasts on_bed purple_bra red_hair reptile reptile_girl scalie undertale undertale_(series) underwear underwear_only undyne unphys video_game_character video_games yellow_body yellow_skin yuri 2020s 2022 2boys 2d 2d_(artwork) animated_skeleton bottom_sans bound_wrists brother brother_and_brother brothers clothed clothed/nude completely_naked completely_nude digital_media_(artwork) duo echoheartx elegantfolly fingering fingering_another fingering_partner fontcest fully_clothed fully_nude gloves grope groping imminent_sex incest male male_only molestation monster naked nude papyrus papyrus_(undertale) papysans questionable_consent red_gloves sans sans_(undertale) seme_papyrus skeleton tape_gag taped_mouth top_papyrus touching_crotch uke_sans undead undertale undertale_(series) video_game_character video_games 2020s 2021 2boys 2d 2d_(artwork) animated_skeleton artist_name bottom_sans brother brother/brother brother_and_brother brothers clothed covering_another's_mouth covering_mouth digital_media_(artwork) duo echoheartx elegantfolly fontcest from_behind fully_clothed gloves grope grope_from_behind groping groping_from_behind hoodie imminent_rape incest indoors male male/male male_only molestation monster non-consensual noncon nonconsensual papyrus papyrus_(undertale) papysans pervert red_gloves sans sans_(undertale) seme_papyrus sexual_harassment skeleton top_papyrus touching_crotch uke_sans undead undertale undertale_(series) video_game_character video_games yaoi 2010s 2018 2_girls 2d 2d_(artwork) 2girls alphyne alphys alphys_(undertale) alternate_version_at_source anthro anthro_on_anthro anthro_only artist_name bed bedroom black_bra black_panties black_underwear blue_body blue_skin breasts canon_couple digital_media_(artwork) duo echoheartx elegantfolly female female/female female_only fish fish_girl indoors lesbian lizard lizard_girl non-mammal_breasts on_bed red_hair reptile reptile_girl scalie undertale undertale_(series) underwear underwear_only undyne unphys video_game_character video_games yellow_body yellow_skin yuri 2010s 2017 2_girls 2d 2d_(artwork) alphyne alphys alphys_(undertale) anthro anthro_only black_bra blue_body blue_skin breasts canon_couple digital_media_(artwork) duo echoheartx elegantfolly female female/female female_only fish glasses indoors lesbian lingerie lizard looking_at_another marine monster non-mammal_breasts pink_bra pink_panties red_hair reptile scalie undertale undertale_(series) underwear undyne unphys video_game_character video_games yellow_body yellow_skin yuri