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2015 2boys 2d anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_eyes blue_penis blush bottom_sans brother brother/brother brother_penetrating_brother brothers carrying carrying_another carrying_partner carrying_position clothed clothed_sex dakuyakko digital_media duo ectopenis erection fontcest genitals heart-shaped_pupils heart_eyes humanoid incest intraspecies larger_male larger_penetrating male male/male male_focus male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy orange_penis papyrus_(undertale) papysans penetration penis sans_(undertale) sequential sex sex_through_clothes sex_through_clothing sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus stand_and_carry_position teeth third-party_source top_papyrus tumblr_username undead undertale undertale_(series) unseen_male_face video_game_character video_games white_background yaoi
2015 2boys 2d anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_eyes blue_penis blush bottom_sans brother brother/brother brother_penetrating_brother brothers carrying carrying_another carrying_partner carrying_position clothed clothed_sex dakuyakko digital_media duo ectopenis erection fontcest genitals heart-shaped_pupils heart_eyes humanoid incest intraspecies larger_male larger_penetrating male male/male male_focus male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy orange_penis papyrus_(undertale) papysans penetration penis sans_(undertale) sequential sex sex_through_clothes sex_through_clothing sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus stand_and_carry_position teeth third-party_source top_papyrus tumblr_username undead undertale undertale_(series) unseen_male_face video_game_character video_games white_background yaoi
2015 2boys 2d animated_skeleton blue_blush blush bottom_sans brother/brother brothers dakuyakko digital_media disembodied_penis duo fontcest heart heart-shaped_pupils humanoid incest male male_focus male_only monster orange_penis papyrus_(undertale) papysans penis penis_on_cheek penis_on_face sans_(undertale) sibling_incest siblings skeleton solo_focus teeth top_papyrus tumblr_username undead undertale undertale_(series) unseen_male unseen_male_face upper_body veiny_penis white_background yaoi
2015 2boys 2d animated_skeleton blue_blush blush bottom_sans brother/brother brothers dakuyakko digital_media disembodied_penis duo fontcest heart heart-shaped_pupils humanoid incest male male_focus male_only monster orange_penis papyrus_(undertale) papysans penis penis_on_cheek penis_on_face sans_(undertale) sibling_incest siblings skeleton solo_focus teeth top_papyrus tumblr_username undead undertale undertale_(series) unseen_male unseen_male_face upper_body veiny_penis white_background yaoi