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2020s 2021 2boys 2d 2d_(artwork) anal animated_skeleton big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller black_censor_bar blue_background blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_on_top bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers censor_bar censored_penis clothed clothed_male clothing crying digital_media_(artwork) drooling duo ectopenis ectoplasm english_text fontcest genitals gloves hooded_jacket hoodie incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller male male_focus male_only male_penetrating mastery_position monster monster_boy motion_lines orange_penis papyrus papyrus_(undertale) papysans penetration penis red_gloves sans sans_(undertale) seme_papyrus sex sibling_incest siblings sitting_on_lap sitting_position skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks solo_focus sweat tears text thrusting tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games white_border xxoxxkm_(pixiv_id_3871107) yaoi

2020s 2021 2boys 2d 2d_(artwork)anal animated_skeleton big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller black_censor_bar blue_background blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_on_top bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers censor_bar censored_penis clothed clothed_male clothing crying digital_media_(artwork)drooling duo ectopenis ectoplasm english_text fontcest genitals gloves hooded_jacket hoodie incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller male male_focus male_only male_penetrating mastery_position monster monster_boy motion_lines orange_penis papyrus papyrus_(undertale)papysans penetration penis red_gloves sans sans_(undertale)seme_papyrus sex sibling_incest siblings sitting_on_lap sitting_position skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks solo_focus sweat tears text thrusting tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series)unseen_male_face video_game_character video_games white_border xxoxxkm_(pixiv_id_3871107)yaoi

2020s 2021 2boys 2d 2d_(artwork) anal animated_skeleton big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller black_censor_bar blue_background blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_on_top bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers censor_bar censored_penis clothed clothed_male clothing crying digital_media_(artwork) drooling duo ectopenis ectoplasm english_text fontcest genitals gloves hooded_jacket hoodie incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller male male_focus male_only male_penetrating mastery_position monster monster_boy motion_lines orange_penis papyrus papyrus_(undertale) papysans penetration penis red_gloves sans sans_(undertale) seme_papyrus sex sibling_incest siblings sitting_on_lap sitting_position skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks solo_focus sweat tears text thrusting tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games white_border xxoxxkm_(pixiv_id_3871107) yaoi

2020s 2021 2boys 2d 2d_(artwork) anal animated_skeleton big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_background blue_blush blue_hoodie blue_jacket blue_penis blush bottom_on_top bottom_sans bottomless bottomless_male brothers crying cussing digital_media_(artwork) drooling duo ectopenis ectoplasm english_text erect_while_penetrated erection erection_under_clothes fontcest genitals gloves grabbing_arms hooded_jacket hoodie incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_out_of_frame male_penetrated male_penetrating male_penetrating_male male_pov monster monster_boy orange_penis papyrus papyrus_(undertale) papysans partial_male penetrating_pov penetration penetrator_pov penis penis_size_difference pov profanity red_gloves sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton small_penis small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus swearing sweat tears text top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games white_border xxoxxkm_(pixiv_id_3871107) yaoi

1:1 1:1_aspect_ratio 2010s 2016 2boys 2d 2d_(artwork) animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male black_background black_hair blue_hoodie blue_jacket blue_tongue bottom_on_top bottom_sans clothed dark_background digital_media_(artwork) fel-fisk glowing hair hooded_jacket hoodie humanoid humanoid_robot jacket larger_male licking male male/male male_only mettasans mettaton mettaton_ex monster monster_boy one_eye_closed partially_clothed partially_nude pink_eyes pink_slippers pink_tongue robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton sinisk skeleton slippers small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom soul soul_sex sweat tongue tongue_out top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games yaoi