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<3_eyes 2018 3boys alternate_universe anal anal_sex animated_skeleton balls blush bodily_fluids bone bottomless bound clothed clothing digital_media_(artwork) english_text erection fallen9choirs fangs fellatio fingerless_gloves gloves glowing glowing_eyes grey_background group group_sex hands_tied handwear heart humanoid_penis incest lust!sans male male/male male_only male_penetrated male_penetrating moan one_eye_closed open_mouth oral papyrus papyrus_(underfell) papyrus_au penetration penile penis penis_grab purple_eyes purple_penis purple_tongue red_eyes sans sans_(underfell) sans_(underlust) sans_au sanscest sex simple_background skeleton speech_bubble tears teeth text threesome tongue trio undead underfell underfell_papyrus underfell_sans underlust underlust_sans undertale undertale_au undertale_fanfiction video_games yaoi
<3_eyes 2018 3boys alternate_universe anal anal_sex animated_skeleton balls blush bodily_fluids bone bottomless bound clothed clothing digital_media_(artwork) english_text erection fallen9choirs fangs fellatio fingerless_gloves gloves glowing glowing_eyes grey_background group group_sex hands_tied handwear heart humanoid_penis incest lust!sans male male/male male_only male_penetrated male_penetrating moan one_eye_closed open_mouth oral papyrus papyrus_(underfell) papyrus_au penetration penile penis penis_grab purple_eyes purple_penis purple_tongue red_eyes sans sans_(underfell) sans_(underlust) sans_au sanscest sex simple_background skeleton speech_bubble tears teeth text threesome tongue trio undead underfell underfell_papyrus underfell_sans underlust underlust_sans undertale undertale_au undertale_fanfiction video_games yaoi
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2018 2boys 2d alternate_universe anal anal_insertion anal_play anal_prodding anal_sex animated animated_skeleton ass ass_grab backsack ballsack begging big_ass big_butt black_gloves black_hoodie black_sclera blush bondage bone brother_and_brother brothers butt collar dead_source dildo drooling ectobody ectobutt english_text everydaysins femboy feminine_male gay gif gloves grabbing_ass hand_on_butt hoodie hoodie_only humanoid improvised_dildo improvised_sex_toy incest latex_gloves male male_focus male_penetrated monster papyrus_(underfell) papyrus_au rape red_ass red_blush red_body red_eyes sans sans_(underfell) sans_au sex_toy skeleton socks solo_focus spiked_collar sweating talking testicles text tongue tongue_out tumblr_username undead underfell underfell_papyrus underfell_sans undertale_(series) undertale_au undertale_fanfiction url white_socks
2018 2boys 2d alternate_universe anal anal_insertion anal_play anal_prodding anal_sex animated animated_skeleton ass ass_grab backsack ballsack begging big_ass big_butt black_gloves black_hoodie black_sclera blush bondage bone brother_and_brother brothers butt collar dead_source dildo drooling ectobody ectobutt english_text everydaysins femboy feminine_male gay gif gloves grabbing_ass hand_on_butt hoodie hoodie_only humanoid improvised_dildo improvised_sex_toy incest latex_gloves male male_focus male_penetrated monster papyrus_(underfell) papyrus_au rape red_ass red_blush red_body red_eyes sans sans_(underfell) sans_au sex_toy skeleton socks solo_focus spiked_collar sweating talking testicles text tongue tongue_out tumblr_username undead underfell underfell_papyrus underfell_sans undertale_(series) undertale_au undertale_fanfiction url white_socks
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... ? accidental_circumstance accidental_incest angry animated animated_skeleton blue_eyes blue_sans_penis blue_sans_tongue blush bone clothed clothed_sex clothing collar confusion fellatio gay gif group heart incest leash male male/male male_only meta_request mistaken_identity multiple_boys nsfwshamecave oral papyrus_(underfell) papyrus_au penis sans sans_(underfell) sans_au sans_blush sans_eye sans_glowing_eye sans_penis sans_tongue semi_incest skeleton undead undertale yaoi