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1:1 1:1_aspect_ratio 2010s 2018 2boys 2d 2d_(artwork) alternate_clothing alternate_costume anal animated_skeleton big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers carrying_partner clothed couch couch_sex crying crying_with_eyes_closed digital_media_(artwork) dominant dominant_male domination door duo ectopenis floor fontcest furniture green_couch hi_res high_res highres implied_bondage incest indoors larger_penetrating larger_penetrating_smaller legs_apart legs_held_open legs_spread living_room male male_only male_penetrated male_penetrating male_penetrating_male maledom monster monster_boy non-consensual noncon nonconsensual nsfwgarbagedump on_couch on_sofa orange_penis papyrus papyrus_(undertale) papysans partially_clothed penetration penis pixiv_id_36285069 rape reverse_suspended_congress sans sans_(undertale) seme_papyrus sex sibling_incest siblings sitting sitting_on_couch sitting_on_sofa skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks socks_on sofa submissive tears top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yandere yaoi

1:1 1:1_aspect_ratio 2010s 2018 2boys 2d 2d_(artwork)alternate_clothing alternate_costume anal animated_skeleton big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers carrying_partner clothed couch couch_sex crying crying_with_eyes_closed digital_media_(artwork)dominant dominant_male domination door duo ectopenis floor fontcest furniture green_couch hi_res high_res highres implied_bondage incest indoors larger_penetrating larger_penetrating_smaller legs_apart legs_held_open legs_spread living_room male male_only male_penetrated male_penetrating male_penetrating_male maledom monster monster_boy non-consensual noncon nonconsensual nsfwgarbagedump on_couch on_sofa orange_penis papyrus papyrus_(undertale)papysans partially_clothed penetration penis pixiv_id_36285069 rape reverse_suspended_congress sans sans_(undertale)seme_papyrus sex sibling_incest siblings sitting sitting_on_couch sitting_on_sofa skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks socks_on sofa submissive tears top_papyrus uke_sans undead undertale undertale_(series)video_game_character video_games yandere yaoi

1:1 1:1_aspect_ratio 2010s 2018 2boys 2d 2d_(artwork) alternate_clothing alternate_costume anal animated_skeleton big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers carrying_partner clothed couch couch_sex crying crying_with_eyes_closed digital_media_(artwork) dominant dominant_male domination door duo ectopenis floor fontcest furniture green_couch hi_res high_res highres implied_bondage incest indoors larger_penetrating larger_penetrating_smaller legs_apart legs_held_open legs_spread living_room male male_only male_penetrated male_penetrating male_penetrating_male maledom monster monster_boy non-consensual noncon nonconsensual nsfwgarbagedump on_couch on_sofa orange_penis papyrus papyrus_(undertale) papysans partially_clothed penetration penis pixiv_id_36285069 rape reverse_suspended_congress sans sans_(undertale) seme_papyrus sex sibling_incest siblings sitting sitting_on_couch sitting_on_sofa skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks socks_on sofa submissive tears top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yandere yaoi

1boy 1cuntboy 2010s 2017 after_sex after_vaginal animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male blue_blush blue_clitoris blue_hoodie blue_jacket blue_pussy blush bottom_sans bottomless brother brother/brother brothers clitoris closed_eyes clothed_male couch cum_leak cum_leaking cum_leaking_out_of_pussy cuntboy cuntboy_focus cuntboysub dominant_male duo ectoplasm ectopussy fontcest gloves hooded_jacket hoodie incest jacket larger_male legs_apart legs_spread male male/cuntboy maledom mmmemmo monster on_couch on_sofa papyrus papyrus_(undertale) papysans pussy pussy_juice pussy_juice_drip red_gloves sans sans_(undertale) seme_papyrus sequence sequential sequential_art sequential_set shirt_lift shirt_up sitting sitting_on_couch skeleton small_sub small_sub_big_dom smaller_cuntboy smaller_sub smaller_sub_bigger_dom socks socks_on sofa spread_legs spread_pussy submissive_cuntboy top_papyrus touching_pussy uke_sans undead undertale undertale_(series) unseen_male_face yaoi

1boy 1cuntboy 2010s 2017 2d 2d_(artwork) animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_clitoris blue_hoodie blue_jacket blue_pussy blush bottom_sans bottomless brother brother/brother brothers clitoris closed_eyes clothed_male couch couch_sex cum cum_in_pussy cum_inside cuntboy cuntboy_focus cuntboy_penetrated cuntboysub digital_media_(artwork) dominant_male duo ectopenis ectoplasm ectopussy fontcest genitals gloves hooded_jacket hoodie incest jacket larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_spread male male/cuntboy male_penetrating male_penetrating_cuntboy maledom mmmemmo monster on_couch on_sofa orange_penis papyrus papyrus_(undertale) papysans penetration penis penis_in_pussy penis_through_clothing pussy pussy_juice pussy_juice_drip red_gloves sans sans_(undertale) seme_papyrus sequence sequential sequential_art sequential_set sex shirt_lift shirt_up sitting sitting_on_couch skeleton small_sub small_sub_big_dom smaller_cuntboy smaller_penetrated smaller_sub smaller_sub_bigger_dom socks socks_on sofa spread_legs spread_pussy submissive_cuntboy top_papyrus touching_pussy uke_sans undead undertale undertale_(series) unseen_male_face vaginal vaginal_penetration vaginal_sex veiny_penis video_game_character video_games x-ray yaoi