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1boy 1cuntboy 2010s 2018 2d 2d_(artwork) animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_pussy blush bottom_sans brother_penetrating_brother brothers carrying carrying_another carrying_partner clothed clothed_male cuntboy digital_media_(artwork) drooling duo ectopenis ectopussy edit edited english_text fontcest from_behind heart-shaped_pupils hugged_from_behind hugging_from_behind imminent_sex incest intraspecies larger_male larger_penetrating larger_penetrating_smaller long_image male male/cuntboy moaning monster monster_boy multiple_images orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_colored penetration penis pink_slippers pussy sans sans_(undertale) seme_papyrus sequence sequential sex sibling_incest siblings simple_background skeleton slippers smaller_penetrated speech_bubble talking talking_to_another talking_to_partner text text_bubble theyaois third-party_edit thrusting thrusting_into_pussy top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi

1boy 1cuntboy 2010s 2018 2d 2d_(artwork)animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_pussy blush bottom_sans brother_penetrating_brother brothers carrying carrying_another carrying_partner clothed clothed_male cuntboy digital_media_(artwork)drooling duo ectopenis ectopussy edit edited english_text fontcest from_behind heart-shaped_pupils hugged_from_behind hugging_from_behind imminent_sex incest intraspecies larger_male larger_penetrating larger_penetrating_smaller long_image male male/cuntboy moaning monster monster_boy multiple_images orange_blush orange_penis papyrus papyrus_(undertale)papysans partially_colored penetration penis pink_slippers pussy sans sans_(undertale)seme_papyrus sequence sequential sex sibling_incest siblings simple_background skeleton slippers smaller_penetrated speech_bubble talking talking_to_another talking_to_partner text text_bubble theyaois third-party_edit thrusting thrusting_into_pussy top_papyrus uke_sans undead undertale undertale_(series)video_games white_background yaoi

1boy 1cuntboy 2010s 2018 2d 2d_(artwork) animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_pussy blush bottom_sans brother_penetrating_brother brothers carrying carrying_another carrying_partner clothed clothed_male cuntboy digital_media_(artwork) drooling duo ectopenis ectopussy edit edited english_text fontcest from_behind heart-shaped_pupils hugged_from_behind hugging_from_behind imminent_sex incest intraspecies larger_male larger_penetrating larger_penetrating_smaller long_image male male/cuntboy moaning monster monster_boy multiple_images orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_colored penetration penis pink_slippers pussy sans sans_(undertale) seme_papyrus sequence sequential sex sibling_incest siblings simple_background skeleton slippers smaller_penetrated speech_bubble talking talking_to_another talking_to_partner text text_bubble theyaois third-party_edit thrusting thrusting_into_pussy top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi

1boy 1cuntboy 2010s 2018 animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_pussy blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers cuntboy drooling duo ectopenis ectopussy english_text fontcest heart-shaped_pupils hugged_from_behind hugging_from_behind incest intraspecies larger_male larger_penetrating larger_penetrating_smaller male male/cuntboy moaning monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_colored penetration penis pussy sans sans_(undertale) seme_papyrus sequence sequential sequential_art sex sibling_incest siblings simple_background skeleton smaller_penetrated speech_bubble text text_bubble theyaois thrusting thrusting_into_pussy top_papyrus uke_sans undead undertale undertale_(series) white_background yaoi

1boy 1boy1girl 1girl 1girl1boy 2017 alphys animated_skeleton anthro breast_grab clothed dinosaur dinosaur_girl duo english_text female_anthro from_behind grabbing_breasts grabbing_from_behind hetero holding_object holding_pencil hoodie hugged_from_behind hugging hugging_from_behind implied_erect_penis implied_erection lab_coat labcoat lameandashamed lizard lizard_girl male male/female monochrome monster monster_girl pencil reptile reptile_girl salphys sans sans_(undertale) sansphys scalie scalie_female skeleton straight test_tube text undead undertale undertale_(series)