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1:1 1:1_aspect_ratio 2016 2boys 2d ahegao ambiguous_penetration animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blush bottom_sans brother/brother brother_penetrating_brother brothers closed_eyes clothed clothed_male clothed_sex clothing digital_media duo eli-sin-g fontcest gay gay_sex heart-shaped_pupils heart_eyes hoodie humanoid incest intraspecies jacket kolesjoie larger_penetrating larger_penetrating_smaller leg_lift legs legs_up male male/male male_ahegao male_focus male_only male_penetrating monochrome monster monster_boy onomatopoeia pants_down papyrus_(undertale) papysans penetration sans_(undertale) sex shirt sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat sweatdrop text text_on_clothing third-party_source thrusting_into_ass tongue tongue_out top_papyrus undead undertale undertale_(series) upside-down upside_down video_game_character video_games white_background yaoi

1:1 1:1_aspect_ratio 2016 2boys 2d ahegao ambiguous_penetration animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blush bottom_sans brother/brother brother_penetrating_brother brothers closed_eyes clothed clothed_male clothed_sex clothing digital_media duo eli-sin-g fontcest gay gay_sex heart-shaped_pupils heart_eyes hoodie humanoid incest intraspecies jacket kolesjoie larger_penetrating larger_penetrating_smaller leg_lift legs legs_up male male/male male_ahegao male_focus male_only male_penetrating monochrome monster monster_boy onomatopoeia pants_down papyrus_(undertale)papysans penetration sans_(undertale)sex shirt sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat sweatdrop text text_on_clothing third-party_source thrusting_into_ass tongue tongue_out top_papyrus undead undertale undertale_(series)upside-down upside_down video_game_character video_games white_background yaoi

1:1 1:1_aspect_ratio 2016 2boys 2d ahegao ambiguous_penetration animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blush bottom_sans brother/brother brother_penetrating_brother brothers closed_eyes clothed clothed_male clothed_sex clothing digital_media duo eli-sin-g fontcest gay gay_sex heart-shaped_pupils heart_eyes hoodie humanoid incest intraspecies jacket kolesjoie larger_penetrating larger_penetrating_smaller leg_lift legs legs_up male male/male male_ahegao male_focus male_only male_penetrating monochrome monster monster_boy onomatopoeia pants_down papyrus_(undertale) papysans penetration sans_(undertale) sex shirt sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat sweatdrop text text_on_clothing third-party_source thrusting_into_ass tongue tongue_out top_papyrus undead undertale undertale_(series) upside-down upside_down video_game_character video_games white_background yaoi

1boy 2015 2d ahegao animated_skeleton blue_blush blush bottom_sans clothed digital_media double_v m_legs male male_ahegao male_only monster sans_(undertale) skeleton solo_male spread_legs suckmytrombone sweat teeth tongue tongue_out undead undertale undertale_(series) v video_games white_background

1boy 2017 2d 3koma ahegao animated_skeleton blue_blush blue_jacket blue_penis blue_tongue blush bodily_fluids bottom_sans comic comic_panel comic_sans digital_media drooling ectopenis english_text fallen9choirs fluids hood hooded_jacket humanoid implied_penetration implied_sex jacket male male_ahegao male_focus male_only monster off_shoulder onomatopoeia partially_clothed partially_nude penis precum profanity saliva sans_(undertale) skeleton solo_focus speech_bubble spread_legs spreading_legs text tongue tongue_out undead undertale undertale_(series) video_games visible_breath