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2010s 2018 2boys 2d 2d_(artwork) animated_skeleton blue_penis bottom_sans bottomless bottomless_male cum cumshot digital_media_(artwork) drooling duo ectopenis ejaculation flowans flower flowey_the_flower gay genitals grin ladybumtickler male male/male male_only monster monster_boy penile penis plant sans sans_(undertale) seme_flowey skeleton smile sniggysmut tentacle tentacle_around_penis tentacle_on_male tentaclejob tentacles_around_ankles tentacles_around_arms tentacles_around_legs tentacles_on_male text top_flowey tumblr uke_sans undead undertale undertale_(series) video_game_character video_games vine_tentacles vinejob vines white_background yaoi yellow_flower
1:1 1:1_aspect_ratio 2015 2boys 2d 2d_(artwork) alternate_version_available animated_skeleton blue_blush blue_penis blush bodily_fluids bottom_sans bound bound_arms clothed clothing digital_media_(artwork) drooling duo ectopenis flowans flower flowey_the_flower flowsans fluids genitals goopynoms grey_background interspecies jacket male male/male male_only malesub monochrome monster monster_boy off_shoulder pants_down pants_pulled_down penis plant plant_tentacle sans sans_(undertale) seme_flowey sex simple_background skeleton submissive submissive_male tentacle tentacle_around_penis tentacle_on_male tentacles_on_male top_flowey uke_sans undead undertale undertale_(series) video_game_character video_games vine_tentacles vinejob vines yaoi yellow_flower
1:1 1:1_aspect_ratio 2015 2boys 2d 2d_(artwork) alternate_version_available animated_skeleton blue_blush blue_penis blush bodily_fluids bottom_sans bound bound_arms clothed clothing digital_media_(artwork) drooling duo ectopenis flowans flower flowey_the_flower flowsans fluids genitals goopynoms grey_background interspecies jacket male male/male male_only malesub monochrome monster monster_boy off_shoulder pants_down pants_pulled_down penis plant plant_tentacle sans sans_(undertale) seme_flowey sex simple_background skeleton submissive submissive_male tentacle tentacle_around_penis tentacle_on_male tentacles_on_male top_flowey uke_sans undead undertale undertale_(series) video_game_character video_games vine_tentacles vinejob vines yaoi yellow_flower
2boys 2d 2d_(artwork) against_wall animated_skeleton blue_blush blue_penis blush bottom_sans clothed clothing digital_media_(artwork) duo ectopenis flowans flower flowey_the_flower flowsans grey_background imminent_sex interspecies male male/male male_only monster monster_boy penis plant plant_penis plant_tentacle sans sans_(undertale) seme_flowey sex simple_background skeleton submissive sweat tentacle tentacle_around_penis tentacle_on_male tentaclejob top_flowey uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games vine_tentacles vinejob vines yaoi yellow_flower
2boys 2d 2d_(artwork) against_wall animated_skeleton blue_blush blue_penis blush bottom_sans clothed clothing digital_media_(artwork) duo ectopenis flowans flower flowey_the_flower flowsans grey_background imminent_sex interspecies male male/male male_only monster monster_boy penis plant plant_penis plant_tentacle sans sans_(undertale) seme_flowey sex simple_background skeleton submissive sweat tentacle tentacle_around_penis tentacle_on_male tentaclejob top_flowey uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games vine_tentacles vinejob vines yaoi yellow_flower
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2boys 2d 2d_(artwork) animated_skeleton artist_name blue_blush blue_penis blush bottom_sans choquiton completely_naked completely_nude completely_nude_male digital_media_(artwork) duo ectopenis flowans flower flowey_the_flower flowsans genitals glowing glowing_genitalia glowing_penis looking_at_genitalia looking_at_penis male male/male male_only malesub monochrome monster monster_boy nude nude_male partially_colored penis plant plant_tentacle rape sans sans_(undertale) seme_flowey sex simple_background skeleton submissive submissive_male tentacle tentacle_around_penis tentacle_on_male tentaclejob tentacles top_flowey uke_sans undead undertale undertale_(series) video_game_character video_games vine_tentacles vinejob vines yaoi
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2boys 2d 2d_(artwork) anal animated_skeleton bigger_dom bigger_dom_smaller_sub bottom_sans carrying carrying_partner carrying_position cussing digital_media_(artwork) dominant dominant_male domination duo ectopenis english_text gaster gaster_(undertale) gay in_heat licking_face male male/male male_focus male_only maledom malesub monster monster_boy penis profanity reverse_stand_and_carry_position reverse_suspended_congress sans sans_(undertale) sanster seme_gaster sex simple_background skeleton sketch small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom spoopy-gaster submissive submissive_male swearing tentacle tentacle_around_penis tentacle_on_male tentacle_sex text text_bubble top_gaster uke_sans undead undertale undertale_(series) video_games yaoi
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1boy 2020s 2023 2d 2d_(artwork) animated_skeleton black_shirt blue_penis blue_tentacles blush bottom_sans digital_media_(artwork) ectopenis genitals legs_apart legs_spread looking_down male male_focus male_only malesub matcha_mothh monster monster_boy pants_around_one_leg pants_pulled_down penis pink_socks precum purple_socks sans sans_(undertale) shirt_lift shirt_up skeleton socks socks_on solo_focus solo_male submissive submissive_male tentacle tentacle_around_arm tentacle_around_leg tentacle_around_penis tentacle_on_male tentacles_around_arms tentacles_around_legs twitter uke_sans undead undertale undertale_(series) video_game_character video_games