1020107

2010s 2019 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers digital_media_(artwork) duo ectopenis english_text fontcest from_front_position ganzooky gay holding_object holding_phone hoodie hoodie_only incest intraspecies larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy nsfwsinningsans orange_blush orange_penis pants_only papyrus papyrus_(undertale) papysans penetration phone phone_call sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat talking_on_phone text thrusting top_papyrus topless topless_male uke_sans undead undertale undertale_(series) undertale_fanfiction video_game_character video_games white_background yaoi

2010s 2019 2boys 2d 2d_(artwork)animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers digital_media_(artwork)duo ectopenis english_text fontcest from_front_position ganzooky gay holding_object holding_phone hoodie hoodie_only incest intraspecies larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy nsfwsinningsans orange_blush orange_penis pants_only papyrus papyrus_(undertale)papysans penetration phone phone_call sans sans_(undertale)seme_papyrus sex sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat talking_on_phone text thrusting top_papyrus topless topless_male uke_sans undead undertale undertale_(series)undertale_fanfiction video_game_character video_games white_background yaoi

2010s 2019 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers digital_media_(artwork) duo ectopenis english_text fontcest from_front_position ganzooky gay holding_object holding_phone hoodie hoodie_only incest intraspecies larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy nsfwsinningsans orange_blush orange_penis pants_only papyrus papyrus_(undertale) papysans penetration phone phone_call sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat talking_on_phone text thrusting top_papyrus topless topless_male uke_sans undead undertale undertale_(series) undertale_fanfiction video_game_character video_games white_background yaoi

2023 2boys 2d 2d_(artwork) animated_skeleton bad_id bad_twitter_id bedroom blue_blush blue_hoodie blue_jacket blue_penis blush boots bottom_on_top bottom_sans brothers clothed dark dark_room digital_media_(artwork) duo erection erection_under_clothes fontcest fudanshipochoc gay glowing heart heart_eyes hooded_jacket hoodie imminent_sex incest indoors jacket male male/male male_only male_pov monster off_shoulder one_eye_closed orange_penis papyrus papyrus_(undertale) papysans partial_male penis_bulge pov power_bottom red_boots sans sans_(undertale) seductive seme_papyrus skeleton solo_focus top_papyrus touching_crotch twitter uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi

2020s 2022 2boys 2d 2d_(artwork) all_fours alternate_costume animated_skeleton antler_headband bell_collar blue_blush blue_body blue_hoodie blue_jacket blush boots bottom_sans boxers_(clothing) brother brother/brother brother_and_brother brothers candle candles christmas christmas_present christmas_sock christmas_tree clothed collar cookie couch digital_media_(artwork) duo ectobody ectopenis ectotongue fellatio floor fontcest furniture gift_box glass gloves green_couch hand_on_another's_head holidays hooded_jacket hoodie incest indoors jacket living_room male male/male male_only merry_christmas monster monster_boy on_floor oral oral_sex orange_blush orange_penis orange_tongue pants_on_floor pants_removed papyrus papyrus_(undertale) papysans penis plate red_boots red_gloves red_hoodie red_jacket red_socks sans sans_(undertale) santa_hat seme_papyrus sex sibling_incest siblings sinncognito sitting sitting_on_floor skeleton socks socks_on sucking_penis top_papyrus uke_sans undead undertale undertale_(series) video_games window yaoi