1030929

2010s 2015 2boys anal animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_eye blush blushing_male boots bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers closed_eyes clothed clothing crying dominant dominant_male duo ectopenis fontcest from_behind_position fully_clothed fully_clothed_male gloves hooded_jacket hoodie incest intraspecies kneel larger_male larger_penetrating larger_penetrating_smaller male male/male male_only maledom malesub monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans penetration penetration_through_clothes penis penis_through_clothing red_boots red_gloves sans sans_(undertale) seme_papyrus sex sex_through_clothes sibling_incest siblings simple_background skeleton smaller_male smaller_penetrated solid_color_background submissive submissive_male tears top_papyrus uke_sans undead undertale undertale_(series) unknown_artist yaoi

2010s 2015 2boys anal animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_eye blush blushing_male boots bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers closed_eyes clothed clothing crying dominant dominant_male duo ectopenis fontcest from_behind_position fully_clothed fully_clothed_male gloves hooded_jacket hoodie incest intraspecies kneel larger_male larger_penetrating larger_penetrating_smaller male male/male male_only maledom malesub monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale)papysans penetration penetration_through_clothes penis penis_through_clothing red_boots red_gloves sans sans_(undertale)seme_papyrus sex sex_through_clothes sibling_incest siblings simple_background skeleton smaller_male smaller_penetrated solid_color_background submissive submissive_male tears top_papyrus uke_sans undead undertale undertale_(series)unknown_artist yaoi

2010s 2015 2boys anal animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_eye blush blushing_male boots bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers closed_eyes clothed clothing crying dominant dominant_male duo ectopenis fontcest from_behind_position fully_clothed fully_clothed_male gloves hooded_jacket hoodie incest intraspecies kneel larger_male larger_penetrating larger_penetrating_smaller male male/male male_only maledom malesub monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans penetration penetration_through_clothes penis penis_through_clothing red_boots red_gloves sans sans_(undertale) seme_papyrus sex sex_through_clothes sibling_incest siblings simple_background skeleton smaller_male smaller_penetrated solid_color_background submissive submissive_male tears top_papyrus uke_sans undead undertale undertale_(series) unknown_artist yaoi

2020s 2021 2boys 2d 2d_(artwork) absurd_res animated_skeleton artist_name black_bottomwear black_clothing black_pants blue_blush blue_clothing blue_eye blue_hoodie blue_jacket blue_penis blue_topwear blush blush_lines blushing_male bodily_fluids bone boots bottom_sans bottomwear brother brother/brother brother_and_brother brothers candy candy_cane christmas christmas_clothing christmas_headwear christmas_sweater christmas_topwear clothed clothing covering_mouth covering_own_mouth dessert digital_media_(artwork) dominant dominant_male duo ectopenis ectoplasm ectotongue english_text fluids fontcest food food_fetish food_insertion food_play footwear ganzooky genital_fluids genitals gloves glowing glowing_eye green_background greeting_card hand_on_mouth hat headgear headwear hi_res holidays hooded_jacket hoodie improvised_sex_toy incest intraspecies jacket legs_apart male male/male male_only maledom malesub merry_christmas monster monster_boy nsfwsinningsans object_insertion orange_blush orange_tongue pants papyrus papyrus_(undertale) papysans pattern_bottomwear pattern_clothing pattern_pants penis pink_footwear pink_slippers precum red_boots red_clothing red_footwear red_gloves red_ribbon ribbon ribbon_on_penis sans sans_(undertale) santa_hat seme_papyrus sibling_incest siblings sitting skeleton slippers snow socks sounding spread_legs striped_bottomwear striped_clothing striped_pants stripes submissive submissive_male sweater text tongue tongue_out top_papyrus topwear translucent_penis two-tone_background uke_sans undead undertale undertale_(series) urethral urethral_insertion video_games white_border yaoi

2010s 2017 2boys anal anal_penetration anal_sex animated_skeleton balls bed bedroom biting_pillow blanket blue_blush blue_body blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers bulge clothed clothing comic comic_page comic_panel crying crying_with_eyes_open dry_humping duo ectobody ectopenis edit edited erection erection_under_clothes fontcest glowing glowing_eye glowing_genitalia glowing_penis groping groping_from_behind hand_in_pants hand_under_clothes humping incest indoors intraspecies large_filesize laying_on_bed looking_at_another looking_at_each_other lying_on_bed male male/male male_only male_penetrated male_penetrating male_penetrating_male monochrome monster monster_boy on_bed on_side orange_balls orange_blush orange_body orange_penis orange_testicles papyrus papyrus_(undertale) papysans partially_colored penetration penis penis_in_anus profanity sans sans_(undertale) seme_papyrus sequence sequential sex sex_on_bed sibling_incest siblings skeleton sleeping sleeping_together supermuuh surprised surprised_expression sweat tears testicles text third-party_edit top_papyrus uke_sans undead under_blanket undertale undertale_(series) waking_up yaoi