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absurdres aqua_flower blue_background echo_flower flower frisk_(undertale) glowing highres solo tinka_tiranor undertale water waterfall
2020 2020s 2boys 2d 2d_(artwork) animated_skeleton beetleevil blue_blush blue_flower blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers completely_nude completely_nude_male covering_mouth covering_own_mouth digital_media_(artwork) duo echo_flower ectopenis ectoplasm english_text evilbeetle finger_to_mouth flower fontcest genitals hand_on_mouth heart-shaped_pupils heart_eyes incest intraspecies kneel male male/male male_penetrating monster monster_boy nude nude_male orange_blush orange_penis outdoor_sex outdoors papyrus papyrus_(undertale) papysans penetration penis plant public public_sex sans sans_(undertale) seme_papyrus sex shh sibling_incest siblings skeleton stealth_sex text top_papyrus twitter uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2020 2020s 2boys 2d 2d_(artwork) animated_skeleton beetleevil blue_blush blue_flower blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers completely_nude completely_nude_male covering_mouth covering_own_mouth digital_media_(artwork) duo echo_flower ectopenis ectoplasm english_text evilbeetle finger_to_mouth flower fontcest genitals hand_on_mouth heart-shaped_pupils heart_eyes incest intraspecies kneel male male/male male_penetrating monster monster_boy nude nude_male orange_blush orange_penis outdoor_sex outdoors papyrus papyrus_(undertale) papysans penetration penis plant public public_sex sans sans_(undertale) seme_papyrus sex shh sibling_incest siblings skeleton stealth_sex text top_papyrus twitter uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2019 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub biting_neck blue_flower boots bottom_sans brother brother/brother brother_and_brother brothers clothed digital_media_(artwork) duo echo_flower flower fontcest foreplay ganzooky gloves hoodie imminent_sex incest intraspecies male male/male male_only monster monster_boy nsfwsinningsans outdoors outside papyrus papyrus_(undertale) papysans plant red_boots red_gloves sans sans_(undertale) seme_papyrus shirt_lift shirt_up sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2010s 2019 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub biting_neck blue_flower boots bottom_sans brother brother/brother brother_and_brother brothers clothed digital_media_(artwork) duo echo_flower flower fontcest foreplay ganzooky gloves hoodie imminent_sex incest intraspecies male male/male male_only monster monster_boy nsfwsinningsans outdoors outside papyrus papyrus_(undertale) papysans plant red_boots red_gloves sans sans_(undertale) seme_papyrus shirt_lift shirt_up sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2015 2girls alphyne alphys anthro anthro_on_anthro anthro_only blue_body blue_flower blue_skin blush canon_couple couple duo echo_flower embrace female female_only fish flower flowers glasses hugging kissing leg_lock lesbian lizard mushrooms nude nude_female plant scalie sex undertaild undertale undertale_(series) undyne unphys waterfall yellow_body yellow_skin yuri
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1_girl 1girl 2016 2boys anthro areola blue_eyes blue_flower blue_fur blue_scales blush boss_monster breasts caprine clitoris close-up closed_eyes collaboration crossover cum cum_in_pussy cum_inside cum_on_breasts cumshot cutout darkmirage echo_flower fangs felching flower fur furry hands_on_hip horn internal kneel knot licking long_ears lucario male male/female male/female/male mammal mario_bros meraence navel nintendo nipples on_top open_mouth oral orgasm outside penetration penis plant pokemon pussy pussylicking red_eyes reverse_cowgirl_position scales scarf sex sitting sky star tapering_penis testicles tongue tongue_out toriel undertale vaginal vaginal_penetration video_games waterfall white_fur yoshi
1_girl 1girl 2016 2boys anthro areola blue_eyes blue_flower blue_fur blue_scales blush boss_monster breasts caprine clitoris close-up closed_eyes collaboration crossover cum cum_in_pussy cum_inside cum_on_breasts cumshot cutout darkmirage echo_flower fangs felching flower fur furry hands_on_hip horn internal kneel knot licking long_ears lucario male male/female male/female/male mammal mario_bros meraence navel nintendo nipples on_top open_mouth oral orgasm outside penetration penis plant pokemon pussy pussylicking red_eyes reverse_cowgirl_position scales scarf sex sitting sky star tapering_penis testicles tongue tongue_out toriel undertale vaginal vaginal_penetration video_games waterfall white_fur yoshi